Finding the Fourth Proportional to 5,485.59, 8,212.32 and 3,399.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,485.59 : 8,212.32 = 3,399.30 : x
2. Step 2: Convert to fraction form
   5,485.59/8,212.32 = 3,399.30/x
3. Step 3: Cross multiply
   5,485.59x = 8,212.32 × 3,399.30
4. Step 4: Simplify right side
   5,485.59x = 27,916,139.38
5. Step 5: Solve for x
   x = 27,916,139.38/5,485.59
6. Step 6: Final answer
   x = 5,088.99