Finding the Fourth Proportional to 1,131.57, 1,561.62 and 634.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.57 : 1,561.62 = 634.26 : x
2. Step 2: Convert to fraction form
   1,131.57/1,561.62 = 634.26/x
3. Step 3: Cross multiply
   1,131.57x = 1,561.62 × 634.26
4. Step 4: Simplify right side
   1,131.57x = 990,473.10
5. Step 5: Solve for x
   x = 990,473.10/1,131.57
6. Step 6: Final answer
   x = 875.31