Finding the Fourth Proportional to 1,025.31, 1,415.40 and 632.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,025.31 : 1,415.40 = 632.56 : x
2. Step 2: Convert to fraction form
   1,025.31/1,415.40 = 632.56/x
3. Step 3: Cross multiply
   1,025.31x = 1,415.40 × 632.56
4. Step 4: Simplify right side
   1,025.31x = 895,325.42
5. Step 5: Solve for x
   x = 895,325.42/1,025.31
6. Step 6: Final answer
   x = 873.22