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Finding the Fourth Proportional to 1,291,969, 1,937,970.78 and 405,505

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Solution

The fourth proportional to 1,291,969, 1,937,970.78 and 405,505 is: 608,262.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291,969 : 1,937,970.78 = 405,505 : x
  2. Step 2: Convert to fraction form
    1,291,969/1,937,970.78 = 405,505/x
  3. Step 3: Cross multiply
    1,291,969x = 1,937,970.78 × 405,505
  4. Step 4: Simplify right side
    1,291,969x = 785,856,841,143.90
  5. Step 5: Solve for x
    x = 785,856,841,143.90/1,291,969
  6. Step 6: Final answer
    x = 608,262.92

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