Finding the Fourth Proportional to 13,411.33, 20,119.31 and 5,518.19

Step by Step Solution

1. Step 1: Write the proportion equation
   13,411.33 : 20,119.31 = 5,518.19 : x
2. Step 2: Convert to fraction form
   13,411.33/20,119.31 = 5,518.19/x
3. Step 3: Cross multiply
   13,411.33x = 20,119.31 × 5,518.19
4. Step 4: Simplify right side
   13,411.33x = 111,022,088.45
5. Step 5: Solve for x
   x = 111,022,088.45/13,411.33
6. Step 6: Final answer
   x = 8,278.23