Finding the Fourth Proportional to 1,066.20, 1,471.98 and 717.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.20 : 1,471.98 = 717.24 : x
2. Step 2: Convert to fraction form
   1,066.20/1,471.98 = 717.24/x
3. Step 3: Cross multiply
   1,066.20x = 1,471.98 × 717.24
4. Step 4: Simplify right side
   1,066.20x = 1,055,762.94
5. Step 5: Solve for x
   x = 1,055,762.94/1,066.20
6. Step 6: Final answer
   x = 990.21