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Finding the Fourth Proportional to 280,485.94, 420,417.25 and 213,705.90

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Solution

The fourth proportional to 280,485.94, 420,417.25 and 213,705.90 is: 320,321.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,485.94 : 420,417.25 = 213,705.90 : x
  2. Step 2: Convert to fraction form
    280,485.94/420,417.25 = 213,705.90/x
  3. Step 3: Cross multiply
    280,485.94x = 420,417.25 × 213,705.90
  4. Step 4: Simplify right side
    280,485.94x = 89,845,646,786.78
  5. Step 5: Solve for x
    x = 89,845,646,786.78/280,485.94
  6. Step 6: Final answer
    x = 320,321.39

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