Finding the Fourth Proportional to 627,641.34, 866,141.55 and 355,760.64

Step by Step Solution

1. Step 1: Write the proportion equation
   627,641.34 : 866,141.55 = 355,760.64 : x
2. Step 2: Convert to fraction form
   627,641.34/866,141.55 = 355,760.64/x
3. Step 3: Cross multiply
   627,641.34x = 866,141.55 × 355,760.64
4. Step 4: Simplify right side
   627,641.34x = 308,139,072,158.59
5. Step 5: Solve for x
   x = 308,139,072,158.59/627,641.34
6. Step 6: Final answer
   x = 490,947.70