Finding the Fourth Proportional to 1,069.16, 1,603.64 and 724.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.16 : 1,603.64 = 724.71 : x
2. Step 2: Convert to fraction form
   1,069.16/1,603.64 = 724.71/x
3. Step 3: Cross multiply
   1,069.16x = 1,603.64 × 724.71
4. Step 4: Simplify right side
   1,069.16x = 1,162,168.67
5. Step 5: Solve for x
   x = 1,162,168.67/1,069.16
6. Step 6: Final answer
   x = 1,086.99