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Finding the Fourth Proportional to 21,304.28, 31,921.10 and 12,959.05

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Solution

The fourth proportional to 21,304.28, 31,921.10 and 12,959.05 is: 19,417.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,304.28 : 31,921.10 = 12,959.05 : x
  2. Step 2: Convert to fraction form
    21,304.28/31,921.10 = 12,959.05/x
  3. Step 3: Cross multiply
    21,304.28x = 31,921.10 × 12,959.05
  4. Step 4: Simplify right side
    21,304.28x = 413,666,906.55
  5. Step 5: Solve for x
    x = 413,666,906.55/21,304.28
  6. Step 6: Final answer
    x = 19,417.08

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