Finding the Fourth Proportional to 3,639.86, 5,022.98 and 2,147.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,639.86 : 5,022.98 = 2,147.78 : x
2. Step 2: Convert to fraction form
   3,639.86/5,022.98 = 2,147.78/x
3. Step 3: Cross multiply
   3,639.86x = 5,022.98 × 2,147.78
4. Step 4: Simplify right side
   3,639.86x = 10,788,255.98
5. Step 5: Solve for x
   x = 10,788,255.98/3,639.86
6. Step 6: Final answer
   x = 2,963.92