Finding the Fourth Proportional to 3,900.52, 5,384.70 and 2,648.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.52 : 5,384.70 = 2,648.20 : x
2. Step 2: Convert to fraction form
   3,900.52/5,384.70 = 2,648.20/x
3. Step 3: Cross multiply
   3,900.52x = 5,384.70 × 2,648.20
4. Step 4: Simplify right side
   3,900.52x = 14,259,762.54
5. Step 5: Solve for x
   x = 14,259,762.54/3,900.52
6. Step 6: Final answer
   x = 3,655.86