Finding the Fourth Proportional to 1,276.58, 1,761.81 and 752.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.58 : 1,761.81 = 752.78 : x
2. Step 2: Convert to fraction form
   1,276.58/1,761.81 = 752.78/x
3. Step 3: Cross multiply
   1,276.58x = 1,761.81 × 752.78
4. Step 4: Simplify right side
   1,276.58x = 1,326,255.33
5. Step 5: Solve for x
   x = 1,326,255.33/1,276.58
6. Step 6: Final answer
   x = 1,038.91