Finding the Fourth Proportional to 2,641.47, 3,959.37 and 1,178.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.47 : 3,959.37 = 1,178.61 : x
2. Step 2: Convert to fraction form
   2,641.47/3,959.37 = 1,178.61/x
3. Step 3: Cross multiply
   2,641.47x = 3,959.37 × 1,178.61
4. Step 4: Simplify right side
   2,641.47x = 4,666,553.08
5. Step 5: Solve for x
   x = 4,666,553.08/2,641.47
6. Step 6: Final answer
   x = 1,766.65