Finding the Fourth Proportional to 1,380.42, 2,079.98 and 1,142.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.42 : 2,079.98 = 1,142.28 : x
2. Step 2: Convert to fraction form
   1,380.42/2,079.98 = 1,142.28/x
3. Step 3: Cross multiply
   1,380.42x = 2,079.98 × 1,142.28
4. Step 4: Simplify right side
   1,380.42x = 2,375,919.55
5. Step 5: Solve for x
   x = 2,375,919.55/1,380.42
6. Step 6: Final answer
   x = 1,721.16