Finding the Fourth Proportional to 725,063.98, 1,086,478.17 and 388,149.34

Step by Step Solution

1. Step 1: Write the proportion equation
   725,063.98 : 1,086,478.17 = 388,149.34 : x
2. Step 2: Convert to fraction form
   725,063.98/1,086,478.17 = 388,149.34/x
3. Step 3: Cross multiply
   725,063.98x = 1,086,478.17 × 388,149.34
4. Step 4: Simplify right side
   725,063.98x = 421,715,784,609.91
5. Step 5: Solve for x
   x = 421,715,784,609.91/725,063.98
6. Step 6: Final answer
   x = 581,625.62