Finding the Fourth Proportional to 1,671.28, 2,306.20 and 1,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,671.28 : 2,306.20 = 1,042.72 : x
2. Step 2: Convert to fraction form
   1,671.28/2,306.20 = 1,042.72/x
3. Step 3: Cross multiply
   1,671.28x = 2,306.20 × 1,042.72
4. Step 4: Simplify right side
   1,671.28x = 2,404,720.86
5. Step 5: Solve for x
   x = 2,404,720.86/1,671.28
6. Step 6: Final answer
   x = 1,438.85