Finding the Fourth Proportional to 3,690.98, 5,535.47 and 2,520.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,690.98 : 5,535.47 = 2,520.78 : x
2. Step 2: Convert to fraction form
   3,690.98/5,535.47 = 2,520.78/x
3. Step 3: Cross multiply
   3,690.98x = 5,535.47 × 2,520.78
4. Step 4: Simplify right side
   3,690.98x = 13,953,687.61
5. Step 5: Solve for x
   x = 13,953,687.61/3,690.98
6. Step 6: Final answer
   x = 3,780.49