Finding the Fourth Proportional to 20,719.72, 31,106.67 and 12,301.59

Step by Step Solution

1. Step 1: Write the proportion equation
   20,719.72 : 31,106.67 = 12,301.59 : x
2. Step 2: Convert to fraction form
   20,719.72/31,106.67 = 12,301.59/x
3. Step 3: Cross multiply
   20,719.72x = 31,106.67 × 12,301.59
4. Step 4: Simplify right side
   20,719.72x = 382,661,500.61
5. Step 5: Solve for x
   x = 382,661,500.61/20,719.72
6. Step 6: Final answer
   x = 18,468.47