Finding the Fourth Proportional to 1,131.62, 1,561.61 and 634.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.62 : 1,561.61 = 634.30 : x
2. Step 2: Convert to fraction form
   1,131.62/1,561.61 = 634.30/x
3. Step 3: Cross multiply
   1,131.62x = 1,561.61 × 634.30
4. Step 4: Simplify right side
   1,131.62x = 990,530.81
5. Step 5: Solve for x
   x = 990,530.81/1,131.62
6. Step 6: Final answer
   x = 875.32