Finding the Fourth Proportional to 2,641.43, 3,959.70 and 1,179.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.43 : 3,959.70 = 1,179.78 : x
2. Step 2: Convert to fraction form
   2,641.43/3,959.70 = 1,179.78/x
3. Step 3: Cross multiply
   2,641.43x = 3,959.70 × 1,179.78
4. Step 4: Simplify right side
   2,641.43x = 4,671,574.87
5. Step 5: Solve for x
   x = 4,671,574.87/2,641.43
6. Step 6: Final answer
   x = 1,768.58