Finding the Fourth Proportional to 1,261.29, 1,736.33 and 1,039.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,261.29 : 1,736.33 = 1,039.89 : x
2. Step 2: Convert to fraction form
   1,261.29/1,736.33 = 1,039.89/x
3. Step 3: Cross multiply
   1,261.29x = 1,736.33 × 1,039.89
4. Step 4: Simplify right side
   1,261.29x = 1,805,587.00
5. Step 5: Solve for x
   x = 1,805,587.00/1,261.29
6. Step 6: Final answer
   x = 1,431.54