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Finding the Fourth Proportional to 28,612.61, 39,484.69 and 15,865.84

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Solution

The fourth proportional to 28,612.61, 39,484.69 and 15,865.84 is: 21,894.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,612.61 : 39,484.69 = 15,865.84 : x
  2. Step 2: Convert to fraction form
    28,612.61/39,484.69 = 15,865.84/x
  3. Step 3: Cross multiply
    28,612.61x = 39,484.69 × 15,865.84
  4. Step 4: Simplify right side
    28,612.61x = 626,457,635.61
  5. Step 5: Solve for x
    x = 626,457,635.61/28,612.61
  6. Step 6: Final answer
    x = 21,894.46

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