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Finding the Fourth Proportional to 12,856.72, 19,287.80 and 4,092.36

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Solution

The fourth proportional to 12,856.72, 19,287.80 and 4,092.36 is: 6,139.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,856.72 : 19,287.80 = 4,092.36 : x
  2. Step 2: Convert to fraction form
    12,856.72/19,287.80 = 4,092.36/x
  3. Step 3: Cross multiply
    12,856.72x = 19,287.80 × 4,092.36
  4. Step 4: Simplify right side
    12,856.72x = 78,932,621.21
  5. Step 5: Solve for x
    x = 78,932,621.21/12,856.72
  6. Step 6: Final answer
    x = 6,139.41

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