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Finding the Fourth Proportional to 399,728.06, 551,631.97 and 218,447.63

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Solution

The fourth proportional to 399,728.06, 551,631.97 and 218,447.63 is: 301,461.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,728.06 : 551,631.97 = 218,447.63 : x
  2. Step 2: Convert to fraction form
    399,728.06/551,631.97 = 218,447.63/x
  3. Step 3: Cross multiply
    399,728.06x = 551,631.97 × 218,447.63
  4. Step 4: Simplify right side
    399,728.06x = 120,502,699,165.18
  5. Step 5: Solve for x
    x = 120,502,699,165.18/399,728.06
  6. Step 6: Final answer
    x = 301,461.69

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