Finding the Third Proportional to 39,870 and 86,751

Step by Step Solution

1. Step 1: Write the proportion equation
   39,870 : 86,751 = 86,751 : x
2. Step 2: Convert to fraction form
   39,870/86,751 = 86,751/x
3. Step 3: Cross multiply
   39,870x = 86,751 × 86,751
4. Step 4: Simplify right side
   39,870x = 7,525,736,001
5. Step 5: Solve for x
   x = 7,525,736,001/39,870
6. Step 6: Final answer
   x = 188,756.86