Finding the Fourth Proportional to 1,393.62, 2,080.70 and 1,255.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.62 : 2,080.70 = 1,255.38 : x
2. Step 2: Convert to fraction form
   1,393.62/2,080.70 = 1,255.38/x
3. Step 3: Cross multiply
   1,393.62x = 2,080.70 × 1,255.38
4. Step 4: Simplify right side
   1,393.62x = 2,612,062.89
5. Step 5: Solve for x
   x = 2,612,062.89/1,393.62
6. Step 6: Final answer
   x = 1,874.30