Finding the Fourth Proportional to 1,131.42, 1,561.45 and 634.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.42 : 1,561.45 = 634.17 : x
2. Step 2: Convert to fraction form
   1,131.42/1,561.45 = 634.17/x
3. Step 3: Cross multiply
   1,131.42x = 1,561.45 × 634.17
4. Step 4: Simplify right side
   1,131.42x = 990,224.75
5. Step 5: Solve for x
   x = 990,224.75/1,131.42
6. Step 6: Final answer
   x = 875.21