Finding the Fourth Proportional to 1,131.50, 1,561.02 and 711.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.50 : 1,561.02 = 711.68 : x
2. Step 2: Convert to fraction form
   1,131.50/1,561.02 = 711.68/x
3. Step 3: Cross multiply
   1,131.50x = 1,561.02 × 711.68
4. Step 4: Simplify right side
   1,131.50x = 1,110,946.71
5. Step 5: Solve for x
   x = 1,110,946.71/1,131.50
6. Step 6: Final answer
   x = 981.84