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Finding the Fourth Proportional to 81,665.89, 122,467.21 and 31,739.45

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Solution

The fourth proportional to 81,665.89, 122,467.21 and 31,739.45 is: 47,596.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,665.89 : 122,467.21 = 31,739.45 : x
  2. Step 2: Convert to fraction form
    81,665.89/122,467.21 = 31,739.45/x
  3. Step 3: Cross multiply
    81,665.89x = 122,467.21 × 31,739.45
  4. Step 4: Simplify right side
    81,665.89x = 3,887,041,196.75
  5. Step 5: Solve for x
    x = 3,887,041,196.75/81,665.89
  6. Step 6: Final answer
    x = 47,596.88

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