Finding the Fourth Proportional to 2,661.96, 3,671.82 and 2,139.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.96 : 3,671.82 = 2,139.24 : x
2. Step 2: Convert to fraction form
   2,661.96/3,671.82 = 2,139.24/x
3. Step 3: Cross multiply
   2,661.96x = 3,671.82 × 2,139.24
4. Step 4: Simplify right side
   2,661.96x = 7,854,904.22
5. Step 5: Solve for x
   x = 7,854,904.22/2,661.96
6. Step 6: Final answer
   x = 2,950.80