Finding the Fourth Proportional to 323,128.16, 484,685.28 and 86,470.80

Step by Step Solution

1. Step 1: Write the proportion equation
   323,128.16 : 484,685.28 = 86,470.80 : x
2. Step 2: Convert to fraction form
   323,128.16/484,685.28 = 86,470.80/x
3. Step 3: Cross multiply
   323,128.16x = 484,685.28 × 86,470.80
4. Step 4: Simplify right side
   323,128.16x = 41,911,123,909.82
5. Step 5: Solve for x
   x = 41,911,123,909.82/323,128.16
6. Step 6: Final answer
   x = 129,704.34