Finding the Fourth Proportional to 1,131.88, 1,561.80 and 666.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.88 : 1,561.80 = 666.04 : x
2. Step 2: Convert to fraction form
   1,131.88/1,561.80 = 666.04/x
3. Step 3: Cross multiply
   1,131.88x = 1,561.80 × 666.04
4. Step 4: Simplify right side
   1,131.88x = 1,040,221.27
5. Step 5: Solve for x
   x = 1,040,221.27/1,131.88
6. Step 6: Final answer
   x = 919.02