Finding the Fourth Proportional to 1,131.40, 1,561.17 and 634.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.40 : 1,561.17 = 634.06 : x
2. Step 2: Convert to fraction form
   1,131.40/1,561.17 = 634.06/x
3. Step 3: Cross multiply
   1,131.40x = 1,561.17 × 634.06
4. Step 4: Simplify right side
   1,131.40x = 989,871.55
5. Step 5: Solve for x
   x = 989,871.55/1,131.40
6. Step 6: Final answer
   x = 874.91