Finding the Fourth Proportional to 2,520.72, 3,781.17 and 790.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.72 : 3,781.17 = 790.56 : x
2. Step 2: Convert to fraction form
   2,520.72/3,781.17 = 790.56/x
3. Step 3: Cross multiply
   2,520.72x = 3,781.17 × 790.56
4. Step 4: Simplify right side
   2,520.72x = 2,989,241.76
5. Step 5: Solve for x
   x = 2,989,241.76/2,520.72
6. Step 6: Final answer
   x = 1,185.87