Finding the Third Proportional to 8,081.30 and 12,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,081.30 : 12,131.72 = 12,131.72 : x
2. Step 2: Convert to fraction form
   8,081.30/12,131.72 = 12,131.72/x
3. Step 3: Cross multiply
   8,081.30x = 12,131.72 × 12,131.72
4. Step 4: Simplify right side
   8,081.30x = 147,178,599.83
5. Step 5: Solve for x
   x = 147,178,599.83/8,081.30
6. Step 6: Final answer
   x = 18,212.25