Finding the Fourth Proportional to 8,320.80, 12,480.96 and 3,389.22

Step by Step Solution

1. Step 1: Write the proportion equation
   8,320.80 : 12,480.96 = 3,389.22 : x
2. Step 2: Convert to fraction form
   8,320.80/12,480.96 = 3,389.22/x
3. Step 3: Cross multiply
   8,320.80x = 12,480.96 × 3,389.22
4. Step 4: Simplify right side
   8,320.80x = 42,300,719.25
5. Step 5: Solve for x
   x = 42,300,719.25/8,320.80
6. Step 6: Final answer
   x = 5,083.73