Finding the Fourth Proportional to 3,525.50, 4,865.20 and 2,128.26

Step by Step Solution

1. Step 1: Write the proportion equation
   3,525.50 : 4,865.20 = 2,128.26 : x
2. Step 2: Convert to fraction form
   3,525.50/4,865.20 = 2,128.26/x
3. Step 3: Cross multiply
   3,525.50x = 4,865.20 × 2,128.26
4. Step 4: Simplify right side
   3,525.50x = 10,354,410.55
5. Step 5: Solve for x
   x = 10,354,410.55/3,525.50
6. Step 6: Final answer
   x = 2,937.00