Finding the Fourth Proportional to 39,810.72, 59,724.72 and 12,108

Step by Step Solution

1. Step 1: Write the proportion equation
   39,810.72 : 59,724.72 = 12,108 : x
2. Step 2: Convert to fraction form
   39,810.72/59,724.72 = 12,108/x
3. Step 3: Cross multiply
   39,810.72x = 59,724.72 × 12,108
4. Step 4: Simplify right side
   39,810.72x = 723,146,909.76
5. Step 5: Solve for x
   x = 723,146,909.76/39,810.72
6. Step 6: Final answer
   x = 18,164.63