Finding the Fourth Proportional to 1,131.72, 1,561.80 and 634.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.72 : 1,561.80 = 634.46 : x
2. Step 2: Convert to fraction form
   1,131.72/1,561.80 = 634.46/x
3. Step 3: Cross multiply
   1,131.72x = 1,561.80 × 634.46
4. Step 4: Simplify right side
   1,131.72x = 990,891.82
5. Step 5: Solve for x
   x = 990,891.82/1,131.72
6. Step 6: Final answer
   x = 875.56