Finding the Fourth Proportional to 3,776.89, 5,216.47 and 2,515.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,776.89 : 5,216.47 = 2,515.87 : x
2. Step 2: Convert to fraction form
   3,776.89/5,216.47 = 2,515.87/x
3. Step 3: Cross multiply
   3,776.89x = 5,216.47 × 2,515.87
4. Step 4: Simplify right side
   3,776.89x = 13,123,941.05
5. Step 5: Solve for x
   x = 13,123,941.05/3,776.89
6. Step 6: Final answer
   x = 3,474.80