Finding the Fourth Proportional to 1,028.52, 1,418.94 and 718.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028.52 : 1,418.94 = 718.20 : x
2. Step 2: Convert to fraction form
   1,028.52/1,418.94 = 718.20/x
3. Step 3: Cross multiply
   1,028.52x = 1,418.94 × 718.20
4. Step 4: Simplify right side
   1,028.52x = 1,019,082.71
5. Step 5: Solve for x
   x = 1,019,082.71/1,028.52
6. Step 6: Final answer
   x = 990.82