Finding the Fourth Proportional to 3,389.30, 5,082.59 and 2,155.01

Step by Step Solution

1. Step 1: Write the proportion equation
   3,389.30 : 5,082.59 = 2,155.01 : x
2. Step 2: Convert to fraction form
   3,389.30/5,082.59 = 2,155.01/x
3. Step 3: Cross multiply
   3,389.30x = 5,082.59 × 2,155.01
4. Step 4: Simplify right side
   3,389.30x = 10,952,996.09
5. Step 5: Solve for x
   x = 10,952,996.09/3,389.30
6. Step 6: Final answer
   x = 3,231.64