Finding the Fourth Proportional to 1,066.12, 1,472.17 and 717.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.12 : 1,472.17 = 717.82 : x
2. Step 2: Convert to fraction form
   1,066.12/1,472.17 = 717.82/x
3. Step 3: Cross multiply
   1,066.12x = 1,472.17 × 717.82
4. Step 4: Simplify right side
   1,066.12x = 1,056,753.07
5. Step 5: Solve for x
   x = 1,056,753.07/1,066.12
6. Step 6: Final answer
   x = 991.21