Finding the Fourth Proportional to 1,017.91, 1,403.76 and 724.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.91 : 1,403.76 = 724.15 : x
2. Step 2: Convert to fraction form
   1,017.91/1,403.76 = 724.15/x
3. Step 3: Cross multiply
   1,017.91x = 1,403.76 × 724.15
4. Step 4: Simplify right side
   1,017.91x = 1,016,532.80
5. Step 5: Solve for x
   x = 1,016,532.80/1,017.91
6. Step 6: Final answer
   x = 998.65