Finding the Fourth Proportional to 1,131.52, 1,561.58 and 634.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.52 : 1,561.58 = 634.15 : x
2. Step 2: Convert to fraction form
   1,131.52/1,561.58 = 634.15/x
3. Step 3: Cross multiply
   1,131.52x = 1,561.58 × 634.15
4. Step 4: Simplify right side
   1,131.52x = 990,275.96
5. Step 5: Solve for x
   x = 990,275.96/1,131.52
6. Step 6: Final answer
   x = 875.17