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Finding the Fourth Proportional to 21,171.78, 31,765.86 and 15,671.52

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Solution

The fourth proportional to 21,171.78, 31,765.86 and 15,671.52 is: 23,513.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,171.78 : 31,765.86 = 15,671.52 : x
  2. Step 2: Convert to fraction form
    21,171.78/31,765.86 = 15,671.52/x
  3. Step 3: Cross multiply
    21,171.78x = 31,765.86 × 15,671.52
  4. Step 4: Simplify right side
    21,171.78x = 497,819,310.31
  5. Step 5: Solve for x
    x = 497,819,310.31/21,171.78
  6. Step 6: Final answer
    x = 23,513.34

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