Finding the Fourth Proportional to 2,663.28, 4,002.21 and 2,196.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.28 : 4,002.21 = 2,196.72 : x
2. Step 2: Convert to fraction form
   2,663.28/4,002.21 = 2,196.72/x
3. Step 3: Cross multiply
   2,663.28x = 4,002.21 × 2,196.72
4. Step 4: Simplify right side
   2,663.28x = 8,791,734.75
5. Step 5: Solve for x
   x = 8,791,734.75/2,663.28
6. Step 6: Final answer
   x = 3,301.09