Finding the Fourth Proportional to 1,131.87, 1,561.98 and 634.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.87 : 1,561.98 = 634.53 : x
2. Step 2: Convert to fraction form
   1,131.87/1,561.98 = 634.53/x
3. Step 3: Cross multiply
   1,131.87x = 1,561.98 × 634.53
4. Step 4: Simplify right side
   1,131.87x = 991,131.41
5. Step 5: Solve for x
   x = 991,131.41/1,131.87
6. Step 6: Final answer
   x = 875.66