Finding the Fourth Proportional to 3,428.24, 5,127.72 and 2,108.74

Step by Step Solution

1. Step 1: Write the proportion equation
   3,428.24 : 5,127.72 = 2,108.74 : x
2. Step 2: Convert to fraction form
   3,428.24/5,127.72 = 2,108.74/x
3. Step 3: Cross multiply
   3,428.24x = 5,127.72 × 2,108.74
4. Step 4: Simplify right side
   3,428.24x = 10,813,028.27
5. Step 5: Solve for x
   x = 10,813,028.27/3,428.24
6. Step 6: Final answer
   x = 3,154.10