Finding the Fourth Proportional to 2,139.12, 2,951.82 and 1,254.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.12 : 2,951.82 = 1,254.78 : x
2. Step 2: Convert to fraction form
   2,139.12/2,951.82 = 1,254.78/x
3. Step 3: Cross multiply
   2,139.12x = 2,951.82 × 1,254.78
4. Step 4: Simplify right side
   2,139.12x = 3,703,884.70
5. Step 5: Solve for x
   x = 3,703,884.70/2,139.12
6. Step 6: Final answer
   x = 1,731.50