Finding the Fourth Proportional to 2,111.96, 3,167.15 and 724.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.96 : 3,167.15 = 724.90 : x
2. Step 2: Convert to fraction form
   2,111.96/3,167.15 = 724.90/x
3. Step 3: Cross multiply
   2,111.96x = 3,167.15 × 724.90
4. Step 4: Simplify right side
   2,111.96x = 2,295,863.47
5. Step 5: Solve for x
   x = 2,295,863.47/2,111.96
6. Step 6: Final answer
   x = 1,087.08