Finding the Fourth Proportional to 2,639.72, 3,961.50 and 1,180.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.72 : 3,961.50 = 1,180.52 : x
2. Step 2: Convert to fraction form
   2,639.72/3,961.50 = 1,180.52/x
3. Step 3: Cross multiply
   2,639.72x = 3,961.50 × 1,180.52
4. Step 4: Simplify right side
   2,639.72x = 4,676,629.98
5. Step 5: Solve for x
   x = 4,676,629.98/2,639.72
6. Step 6: Final answer
   x = 1,771.64