Finding the Third Proportional to 8,087.34 and 12,689.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,087.34 : 12,689.16 = 12,689.16 : x
2. Step 2: Convert to fraction form
   8,087.34/12,689.16 = 12,689.16/x
3. Step 3: Cross multiply
   8,087.34x = 12,689.16 × 12,689.16
4. Step 4: Simplify right side
   8,087.34x = 161,014,686.34
5. Step 5: Solve for x
   x = 161,014,686.34/8,087.34
6. Step 6: Final answer
   x = 19,909.46