Finding the Fourth Proportional to 2,620.17, 3,948.30 and 2,168.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.17 : 3,948.30 = 2,168.15 : x
2. Step 2: Convert to fraction form
   2,620.17/3,948.30 = 2,168.15/x
3. Step 3: Cross multiply
   2,620.17x = 3,948.30 × 2,168.15
4. Step 4: Simplify right side
   2,620.17x = 8,560,486.90
5. Step 5: Solve for x
   x = 8,560,486.90/2,620.17
6. Step 6: Final answer
   x = 3,267.15