Finding the Fourth Proportional to 861,061.70, 1,290,892.71 and 300,489.86

Step by Step Solution

1. Step 1: Write the proportion equation
   861,061.70 : 1,290,892.71 = 300,489.86 : x
2. Step 2: Convert to fraction form
   861,061.70/1,290,892.71 = 300,489.86/x
3. Step 3: Cross multiply
   861,061.70x = 1,290,892.71 × 300,489.86
4. Step 4: Simplify right side
   861,061.70x = 387,900,169,702.92
5. Step 5: Solve for x
   x = 387,900,169,702.92/861,061.70
6. Step 6: Final answer
   x = 450,490.56