Finding the Fourth Proportional to 2,656.60, 3,671.22 and 2,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.60 : 3,671.22 = 2,131.72 : x
2. Step 2: Convert to fraction form
   2,656.60/3,671.22 = 2,131.72/x
3. Step 3: Cross multiply
   2,656.60x = 3,671.22 × 2,131.72
4. Step 4: Simplify right side
   2,656.60x = 7,826,013.10
5. Step 5: Solve for x
   x = 7,826,013.10/2,656.60
6. Step 6: Final answer
   x = 2,945.88