Finding the Fourth Proportional to 2,111.39, 3,166.98 and 724.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.39 : 3,166.98 = 724.85 : x
2. Step 2: Convert to fraction form
   2,111.39/3,166.98 = 724.85/x
3. Step 3: Cross multiply
   2,111.39x = 3,166.98 × 724.85
4. Step 4: Simplify right side
   2,111.39x = 2,295,585.45
5. Step 5: Solve for x
   x = 2,295,585.45/2,111.39
6. Step 6: Final answer
   x = 1,087.24