Finding the Fourth Proportional to 1,131.08, 1,561.22 and 717.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.08 : 1,561.22 = 717.32 : x
2. Step 2: Convert to fraction form
   1,131.08/1,561.22 = 717.32/x
3. Step 3: Cross multiply
   1,131.08x = 1,561.22 × 717.32
4. Step 4: Simplify right side
   1,131.08x = 1,119,894.33
5. Step 5: Solve for x
   x = 1,119,894.33/1,131.08
6. Step 6: Final answer
   x = 990.11