Finding the Fourth Proportional to 12,139.31, 18,208.56 and 3,819.14

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.31 : 18,208.56 = 3,819.14 : x
2. Step 2: Convert to fraction form
   12,139.31/18,208.56 = 3,819.14/x
3. Step 3: Cross multiply
   12,139.31x = 18,208.56 × 3,819.14
4. Step 4: Simplify right side
   12,139.31x = 69,540,948.80
5. Step 5: Solve for x
   x = 69,540,948.80/12,139.31
6. Step 6: Final answer
   x = 5,728.58