Finding the Fourth Proportional to 1,128.32, 1,555.52 and 754.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.32 : 1,555.52 = 754.72 : x
2. Step 2: Convert to fraction form
   1,128.32/1,555.52 = 754.72/x
3. Step 3: Cross multiply
   1,128.32x = 1,555.52 × 754.72
4. Step 4: Simplify right side
   1,128.32x = 1,173,982.05
5. Step 5: Solve for x
   x = 1,173,982.05/1,128.32
6. Step 6: Final answer
   x = 1,040.47