Finding the Third Proportional to 64,815 and 87,105

Step by Step Solution

1. Step 1: Write the proportion equation
   64,815 : 87,105 = 87,105 : x
2. Step 2: Convert to fraction form
   64,815/87,105 = 87,105/x
3. Step 3: Cross multiply
   64,815x = 87,105 × 87,105
4. Step 4: Simplify right side
   64,815x = 7,587,281,025
5. Step 5: Solve for x
   x = 7,587,281,025/64,815
6. Step 6: Final answer
   x = 117,060.57