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Finding the Fourth Proportional to 28,978,694.84, 39,991,557.90 and 15,926,416.28

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Solution

The fourth proportional to 28,978,694.84, 39,991,557.90 and 15,926,416.28 is: 21,978,981.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978,694.84 : 39,991,557.90 = 15,926,416.28 : x
  2. Step 2: Convert to fraction form
    28,978,694.84/39,991,557.90 = 15,926,416.28/x
  3. Step 3: Cross multiply
    28,978,694.84x = 39,991,557.90 × 15,926,416.28
  4. Step 4: Simplify right side
    28,978,694.84x = 636,922,198,801,122.50
  5. Step 5: Solve for x
    x = 636,922,198,801,122.50/28,978,694.84
  6. Step 6: Final answer
    x = 21,978,981.54

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