Finding the Third Proportional to 7,861 and 12,155

Step by Step Solution

1. Step 1: Write the proportion equation
   7,861 : 12,155 = 12,155 : x
2. Step 2: Convert to fraction form
   7,861/12,155 = 12,155/x
3. Step 3: Cross multiply
   7,861x = 12,155 × 12,155
4. Step 4: Simplify right side
   7,861x = 147,744,025
5. Step 5: Solve for x
   x = 147,744,025/7,861
6. Step 6: Final answer
   x = 18,794.56