Finding the Fourth Proportional to 1,131.60, 1,561.61 and 634.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.60 : 1,561.61 = 634.25 : x
2. Step 2: Convert to fraction form
   1,131.60/1,561.61 = 634.25/x
3. Step 3: Cross multiply
   1,131.60x = 1,561.61 × 634.25
4. Step 4: Simplify right side
   1,131.60x = 990,440.16
5. Step 5: Solve for x
   x = 990,440.16/1,131.60
6. Step 6: Final answer
   x = 875.26