Finding the Fourth Proportional to 40,601.71, 60,901.89 and 12,138.73

Step by Step Solution

1. Step 1: Write the proportion equation
   40,601.71 : 60,901.89 = 12,138.73 : x
2. Step 2: Convert to fraction form
   40,601.71/60,901.89 = 12,138.73/x
3. Step 3: Cross multiply
   40,601.71x = 60,901.89 × 12,138.73
4. Step 4: Simplify right side
   40,601.71x = 739,271,606.66
5. Step 5: Solve for x
   x = 739,271,606.66/40,601.71
6. Step 6: Final answer
   x = 18,207.89