Finding the Fourth Proportional to 2,144.15, 2,959.06 and 1,247.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.15 : 2,959.06 = 1,247.91 : x
2. Step 2: Convert to fraction form
   2,144.15/2,959.06 = 1,247.91/x
3. Step 3: Cross multiply
   2,144.15x = 2,959.06 × 1,247.91
4. Step 4: Simplify right side
   2,144.15x = 3,692,625.18
5. Step 5: Solve for x
   x = 3,692,625.18/2,144.15
6. Step 6: Final answer
   x = 1,722.19