Finding the Fourth Proportional to 2,713.55, 4,070.72 and 864.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,713.55 : 4,070.72 = 864.11 : x
2. Step 2: Convert to fraction form
   2,713.55/4,070.72 = 864.11/x
3. Step 3: Cross multiply
   2,713.55x = 4,070.72 × 864.11
4. Step 4: Simplify right side
   2,713.55x = 3,517,562.20
5. Step 5: Solve for x
   x = 3,517,562.20/2,713.55
6. Step 6: Final answer
   x = 1,296.30