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Finding the Fourth Proportional to 28,978, 39,991.64 and 16,402.80

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Solution

The fourth proportional to 28,978, 39,991.64 and 16,402.80 is: 22,637.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978 : 39,991.64 = 16,402.80 : x
  2. Step 2: Convert to fraction form
    28,978/39,991.64 = 16,402.80/x
  3. Step 3: Cross multiply
    28,978x = 39,991.64 × 16,402.80
  4. Step 4: Simplify right side
    28,978x = 655,974,872.59
  5. Step 5: Solve for x
    x = 655,974,872.59/28,978
  6. Step 6: Final answer
    x = 22,637.00

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