Finding the Fourth Proportional to 2,172.96, 3,238.83 and 2,155.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.96 : 3,238.83 = 2,155.95 : x
2. Step 2: Convert to fraction form
   2,172.96/3,238.83 = 2,155.95/x
3. Step 3: Cross multiply
   2,172.96x = 3,238.83 × 2,155.95
4. Step 4: Simplify right side
   2,172.96x = 6,982,755.54
5. Step 5: Solve for x
   x = 6,982,755.54/2,172.96
6. Step 6: Final answer
   x = 3,213.48