Finding the Fourth Proportional to 1,025.57, 1,415.50 and 627.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,025.57 : 1,415.50 = 627.30 : x
2. Step 2: Convert to fraction form
   1,025.57/1,415.50 = 627.30/x
3. Step 3: Cross multiply
   1,025.57x = 1,415.50 × 627.30
4. Step 4: Simplify right side
   1,025.57x = 887,943.15
5. Step 5: Solve for x
   x = 887,943.15/1,025.57
6. Step 6: Final answer
   x = 865.80