Finding the Fourth Proportional to 3,396.21, 5,091.27 and 2,160.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,396.21 : 5,091.27 = 2,160.15 : x
2. Step 2: Convert to fraction form
   3,396.21/5,091.27 = 2,160.15/x
3. Step 3: Cross multiply
   3,396.21x = 5,091.27 × 2,160.15
4. Step 4: Simplify right side
   3,396.21x = 10,997,906.89
5. Step 5: Solve for x
   x = 10,997,906.89/3,396.21
6. Step 6: Final answer
   x = 3,238.29