Finding the Fourth Proportional to 1,131.90, 1,561.98 and 634.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.90 : 1,561.98 = 634.52 : x
2. Step 2: Convert to fraction form
   1,131.90/1,561.98 = 634.52/x
3. Step 3: Cross multiply
   1,131.90x = 1,561.98 × 634.52
4. Step 4: Simplify right side
   1,131.90x = 991,099.74
5. Step 5: Solve for x
   x = 991,099.74/1,131.90
6. Step 6: Final answer
   x = 875.61