Finding the Fourth Proportional to 1,272.80, 1,755.72 and 748.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.80 : 1,755.72 = 748.72 : x
2. Step 2: Convert to fraction form
   1,272.80/1,755.72 = 748.72/x
3. Step 3: Cross multiply
   1,272.80x = 1,755.72 × 748.72
4. Step 4: Simplify right side
   1,272.80x = 1,314,542.68
5. Step 5: Solve for x
   x = 1,314,542.68/1,272.80
6. Step 6: Final answer
   x = 1,032.80