Finding the Fourth Proportional to 39,811.72, 59,726.22 and 12,109

Step by Step Solution

1. Step 1: Write the proportion equation
   39,811.72 : 59,726.22 = 12,109 : x
2. Step 2: Convert to fraction form
   39,811.72/59,726.22 = 12,109/x
3. Step 3: Cross multiply
   39,811.72x = 59,726.22 × 12,109
4. Step 4: Simplify right side
   39,811.72x = 723,224,797.98
5. Step 5: Solve for x
   x = 723,224,797.98/39,811.72
6. Step 6: Final answer
   x = 18,166.13