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Finding the Fourth Proportional to 420,085.96, 629,939.40 and 120,497.80

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Solution

The fourth proportional to 420,085.96, 629,939.40 and 120,497.80 is: 180,692.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,085.96 : 629,939.40 = 120,497.80 : x
  2. Step 2: Convert to fraction form
    420,085.96/629,939.40 = 120,497.80/x
  3. Step 3: Cross multiply
    420,085.96x = 629,939.40 × 120,497.80
  4. Step 4: Simplify right side
    420,085.96x = 75,906,311,833.32
  5. Step 5: Solve for x
    x = 75,906,311,833.32/420,085.96
  6. Step 6: Final answer
    x = 180,692.33

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