Finding the Fourth Proportional to 5,640.87, 7,790.54 and 3,877.59

Step by Step Solution

1. Step 1: Write the proportion equation
   5,640.87 : 7,790.54 = 3,877.59 : x
2. Step 2: Convert to fraction form
   5,640.87/7,790.54 = 3,877.59/x
3. Step 3: Cross multiply
   5,640.87x = 7,790.54 × 3,877.59
4. Step 4: Simplify right side
   5,640.87x = 30,208,520.00
5. Step 5: Solve for x
   x = 30,208,520.00/5,640.87
6. Step 6: Final answer
   x = 5,355.29