Finding the Fourth Proportional to 38,439.31, 57,662.61 and 12,147.94

Step by Step Solution

1. Step 1: Write the proportion equation
   38,439.31 : 57,662.61 = 12,147.94 : x
2. Step 2: Convert to fraction form
   38,439.31/57,662.61 = 12,147.94/x
3. Step 3: Cross multiply
   38,439.31x = 57,662.61 × 12,147.94
4. Step 4: Simplify right side
   38,439.31x = 700,481,926.52
5. Step 5: Solve for x
   x = 700,481,926.52/38,439.31
6. Step 6: Final answer
   x = 18,223.06