Finding the Fourth Proportional to 13,419.50, 20,126.09 and 5,519.97

Step by Step Solution

1. Step 1: Write the proportion equation
   13,419.50 : 20,126.09 = 5,519.97 : x
2. Step 2: Convert to fraction form
   13,419.50/20,126.09 = 5,519.97/x
3. Step 3: Cross multiply
   13,419.50x = 20,126.09 × 5,519.97
4. Step 4: Simplify right side
   13,419.50x = 111,095,426.82
5. Step 5: Solve for x
   x = 111,095,426.82/13,419.50
6. Step 6: Final answer
   x = 8,278.66