Finding the Fourth Proportional to 2,111.12, 3,167.16 and 724.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.12 : 3,167.16 = 724.40 : x
2. Step 2: Convert to fraction form
   2,111.12/3,167.16 = 724.40/x
3. Step 3: Cross multiply
   2,111.12x = 3,167.16 × 724.40
4. Step 4: Simplify right side
   2,111.12x = 2,294,290.70
5. Step 5: Solve for x
   x = 2,294,290.70/2,111.12
6. Step 6: Final answer
   x = 1,086.76