Finding the Fourth Proportional to 2,639.39, 3,642.91 and 2,196.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.39 : 3,642.91 = 2,196.86 : x
2. Step 2: Convert to fraction form
   2,639.39/3,642.91 = 2,196.86/x
3. Step 3: Cross multiply
   2,639.39x = 3,642.91 × 2,196.86
4. Step 4: Simplify right side
   2,639.39x = 8,002,939.56
5. Step 5: Solve for x
   x = 8,002,939.56/2,639.39
6. Step 6: Final answer
   x = 3,032.12