Finding the Fourth Proportional to 3,900.88, 5,821.13 and 3,485.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.88 : 5,821.13 = 3,485.50 : x
2. Step 2: Convert to fraction form
   3,900.88/5,821.13 = 3,485.50/x
3. Step 3: Cross multiply
   3,900.88x = 5,821.13 × 3,485.50
4. Step 4: Simplify right side
   3,900.88x = 20,289,548.62
5. Step 5: Solve for x
   x = 20,289,548.62/3,900.88
6. Step 6: Final answer
   x = 5,201.27