Finding the Fourth Proportional to 2,196.90, 3,292.56 and 2,139.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.90 : 3,292.56 = 2,139.48 : x
2. Step 2: Convert to fraction form
   2,196.90/3,292.56 = 2,139.48/x
3. Step 3: Cross multiply
   2,196.90x = 3,292.56 × 2,139.48
4. Step 4: Simplify right side
   2,196.90x = 7,044,366.27
5. Step 5: Solve for x
   x = 7,044,366.27/2,196.90
6. Step 6: Final answer
   x = 3,206.50