Finding the Fourth Proportional to 627,689.18, 866,192.83 and 355,782.10

Step by Step Solution

1. Step 1: Write the proportion equation
   627,689.18 : 866,192.83 = 355,782.10 : x
2. Step 2: Convert to fraction form
   627,689.18/866,192.83 = 355,782.10/x
3. Step 3: Cross multiply
   627,689.18x = 866,192.83 × 355,782.10
4. Step 4: Simplify right side
   627,689.18x = 308,175,904,062.34
5. Step 5: Solve for x
   x = 308,175,904,062.34/627,689.18
6. Step 6: Final answer
   x = 490,968.96