Finding the Fourth Proportional to 725,061.48, 1,086,474.42 and 388,146.84

Step by Step Solution

1. Step 1: Write the proportion equation
   725,061.48 : 1,086,474.42 = 388,146.84 : x
2. Step 2: Convert to fraction form
   725,061.48/1,086,474.42 = 388,146.84/x
3. Step 3: Cross multiply
   725,061.48x = 1,086,474.42 × 388,146.84
4. Step 4: Simplify right side
   725,061.48x = 421,711,612,863.83
5. Step 5: Solve for x
   x = 421,711,612,863.83/725,061.48
6. Step 6: Final answer
   x = 581,621.87