Finding the Fourth Proportional to 2,639.01, 3,642.39 and 2,196.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.01 : 3,642.39 = 2,196.48 : x
2. Step 2: Convert to fraction form
   2,639.01/3,642.39 = 2,196.48/x
3. Step 3: Cross multiply
   2,639.01x = 3,642.39 × 2,196.48
4. Step 4: Simplify right side
   2,639.01x = 8,000,436.79
5. Step 5: Solve for x
   x = 8,000,436.79/2,639.01
6. Step 6: Final answer
   x = 3,031.61