Finding the Fourth Proportional to 2,761.02, 4,142.33 and 813.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,761.02 : 4,142.33 = 813.23 : x
2. Step 2: Convert to fraction form
   2,761.02/4,142.33 = 813.23/x
3. Step 3: Cross multiply
   2,761.02x = 4,142.33 × 813.23
4. Step 4: Simplify right side
   2,761.02x = 3,368,667.03
5. Step 5: Solve for x
   x = 3,368,667.03/2,761.02
6. Step 6: Final answer
   x = 1,220.08