Finding the Fourth Proportional to 2,752.10, 4,128.55 and 903.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,752.10 : 4,128.55 = 903.30 : x
2. Step 2: Convert to fraction form
   2,752.10/4,128.55 = 903.30/x
3. Step 3: Cross multiply
   2,752.10x = 4,128.55 × 903.30
4. Step 4: Simplify right side
   2,752.10x = 3,729,319.22
5. Step 5: Solve for x
   x = 3,729,319.22/2,752.10
6. Step 6: Final answer
   x = 1,355.08