Finding the Fourth Proportional to 1,131.32, 1,561.20 and 627.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.32 : 1,561.20 = 627.18 : x
2. Step 2: Convert to fraction form
   1,131.32/1,561.20 = 627.18/x
3. Step 3: Cross multiply
   1,131.32x = 1,561.20 × 627.18
4. Step 4: Simplify right side
   1,131.32x = 979,153.42
5. Step 5: Solve for x
   x = 979,153.42/1,131.32
6. Step 6: Final answer
   x = 865.50