Finding the Fourth Proportional to 1,131.65, 1,561.71 and 634.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.65 : 1,561.71 = 634.24 : x
2. Step 2: Convert to fraction form
   1,131.65/1,561.71 = 634.24/x
3. Step 3: Cross multiply
   1,131.65x = 1,561.71 × 634.24
4. Step 4: Simplify right side
   1,131.65x = 990,495.78
5. Step 5: Solve for x
   x = 990,495.78/1,131.65
6. Step 6: Final answer
   x = 875.27