Finding the Fourth Proportional to 1,423.74, 2,124.59 and 1,259.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.74 : 2,124.59 = 1,259.72 : x
2. Step 2: Convert to fraction form
   1,423.74/2,124.59 = 1,259.72/x
3. Step 3: Cross multiply
   1,423.74x = 2,124.59 × 1,259.72
4. Step 4: Simplify right side
   1,423.74x = 2,676,371.59
5. Step 5: Solve for x
   x = 2,676,371.59/1,423.74
6. Step 6: Final answer
   x = 1,879.82