Finding the Fourth Proportional to 1,671.96, 2,308.42 and 1,042.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,671.96 : 2,308.42 = 1,042.74 : x
2. Step 2: Convert to fraction form
   1,671.96/2,308.42 = 1,042.74/x
3. Step 3: Cross multiply
   1,671.96x = 2,308.42 × 1,042.74
4. Step 4: Simplify right side
   1,671.96x = 2,407,073.49
5. Step 5: Solve for x
   x = 2,407,073.49/1,671.96
6. Step 6: Final answer
   x = 1,439.67