Finding the Fourth Proportional to 627,036.72, 865,281.72 and 355,106.57

Step by Step Solution

1. Step 1: Write the proportion equation
   627,036.72 : 865,281.72 = 355,106.57 : x
2. Step 2: Convert to fraction form
   627,036.72/865,281.72 = 355,106.57/x
3. Step 3: Cross multiply
   627,036.72x = 865,281.72 × 355,106.57
4. Step 4: Simplify right side
   627,036.72x = 307,267,223,672.90
5. Step 5: Solve for x
   x = 307,267,223,672.90/627,036.72
6. Step 6: Final answer
   x = 490,030.67