Finding the Fourth Proportional to 2,760.96, 4,142.34 and 813.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,760.96 : 4,142.34 = 813.18 : x
2. Step 2: Convert to fraction form
   2,760.96/4,142.34 = 813.18/x
3. Step 3: Cross multiply
   2,760.96x = 4,142.34 × 813.18
4. Step 4: Simplify right side
   2,760.96x = 3,368,468.04
5. Step 5: Solve for x
   x = 3,368,468.04/2,760.96
6. Step 6: Final answer
   x = 1,220.04