Finding the Third Proportional to 10,659 and 21,319.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,659 : 21,319.50 = 21,319.50 : x
2. Step 2: Convert to fraction form
   10,659/21,319.50 = 21,319.50/x
3. Step 3: Cross multiply
   10,659x = 21,319.50 × 21,319.50
4. Step 4: Simplify right side
   10,659x = 454,521,080.25
5. Step 5: Solve for x
   x = 454,521,080.25/10,659
6. Step 6: Final answer
   x = 42,642.00