Finding the Third Proportional to 8,615 and 12,131

Step by Step Solution

1. Step 1: Write the proportion equation
   8,615 : 12,131 = 12,131 : x
2. Step 2: Convert to fraction form
   8,615/12,131 = 12,131/x
3. Step 3: Cross multiply
   8,615x = 12,131 × 12,131
4. Step 4: Simplify right side
   8,615x = 147,161,161
5. Step 5: Solve for x
   x = 147,161,161/8,615
6. Step 6: Final answer
   x = 17,081.97