Finding the Fourth Proportional to 39,808.72, 59,721.72 and 12,106

Step by Step Solution

1. Step 1: Write the proportion equation
   39,808.72 : 59,721.72 = 12,106 : x
2. Step 2: Convert to fraction form
   39,808.72/59,721.72 = 12,106/x
3. Step 3: Cross multiply
   39,808.72x = 59,721.72 × 12,106
4. Step 4: Simplify right side
   39,808.72x = 722,991,142.32
5. Step 5: Solve for x
   x = 722,991,142.32/39,808.72
6. Step 6: Final answer
   x = 18,161.63