Finding the Fourth Proportional to 1,131.53, 1,561.50 and 634.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.53 : 1,561.50 = 634.10 : x
2. Step 2: Convert to fraction form
   1,131.53/1,561.50 = 634.10/x
3. Step 3: Cross multiply
   1,131.53x = 1,561.50 × 634.10
4. Step 4: Simplify right side
   1,131.53x = 990,139.34
5. Step 5: Solve for x
   x = 990,139.34/1,131.53
6. Step 6: Final answer
   x = 875.05