Finding the Fourth Proportional to 2,213.55, 3,320.61 and 752.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.55 : 3,320.61 = 752.31 : x
2. Step 2: Convert to fraction form
   2,213.55/3,320.61 = 752.31/x
3. Step 3: Cross multiply
   2,213.55x = 3,320.61 × 752.31
4. Step 4: Simplify right side
   2,213.55x = 2,498,128.11
5. Step 5: Solve for x
   x = 2,498,128.11/2,213.55
6. Step 6: Final answer
   x = 1,128.56