Finding the Fourth Proportional to 1,275.27, 1,760.91 and 1,039.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.27 : 1,760.91 = 1,039.25 : x
2. Step 2: Convert to fraction form
   1,275.27/1,760.91 = 1,039.25/x
3. Step 3: Cross multiply
   1,275.27x = 1,760.91 × 1,039.25
4. Step 4: Simplify right side
   1,275.27x = 1,830,030.12
5. Step 5: Solve for x
   x = 1,830,030.12/1,275.27
6. Step 6: Final answer
   x = 1,435.01