Finding the Fourth Proportional to 1,131.62, 1,561.08 and 711.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.62 : 1,561.08 = 711.76 : x
2. Step 2: Convert to fraction form
   1,131.62/1,561.08 = 711.76/x
3. Step 3: Cross multiply
   1,131.62x = 1,561.08 × 711.76
4. Step 4: Simplify right side
   1,131.62x = 1,111,114.30
5. Step 5: Solve for x
   x = 1,111,114.30/1,131.62
6. Step 6: Final answer
   x = 981.88