Finding the Fourth Proportional to 2,520.90, 3,781.89 and 765.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.90 : 3,781.89 = 765.96 : x
2. Step 2: Convert to fraction form
   2,520.90/3,781.89 = 765.96/x
3. Step 3: Cross multiply
   2,520.90x = 3,781.89 × 765.96
4. Step 4: Simplify right side
   2,520.90x = 2,896,776.46
5. Step 5: Solve for x
   x = 2,896,776.46/2,520.90
6. Step 6: Final answer
   x = 1,149.10