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Finding the Fourth Proportional to 81,791.20, 122,686.80 and 26,387.20

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Solution

The fourth proportional to 81,791.20, 122,686.80 and 26,387.20 is: 39,580.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,791.20 : 122,686.80 = 26,387.20 : x
  2. Step 2: Convert to fraction form
    81,791.20/122,686.80 = 26,387.20/x
  3. Step 3: Cross multiply
    81,791.20x = 122,686.80 × 26,387.20
  4. Step 4: Simplify right side
    81,791.20x = 3,237,361,128.96
  5. Step 5: Solve for x
    x = 3,237,361,128.96/81,791.20
  6. Step 6: Final answer
    x = 39,580.80

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