Finding the Fourth Proportional to 1,392.72, 2,079.30 and 1,149.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.72 : 2,079.30 = 1,149.72 : x
2. Step 2: Convert to fraction form
   1,392.72/2,079.30 = 1,149.72/x
3. Step 3: Cross multiply
   1,392.72x = 2,079.30 × 1,149.72
4. Step 4: Simplify right side
   1,392.72x = 2,390,612.80
5. Step 5: Solve for x
   x = 2,390,612.80/1,392.72
6. Step 6: Final answer
   x = 1,716.51