Finding the Third Proportional to 5,139.50 and 10,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.50 : 10,643.50 = 10,643.50 : x
2. Step 2: Convert to fraction form
   5,139.50/10,643.50 = 10,643.50/x
3. Step 3: Cross multiply
   5,139.50x = 10,643.50 × 10,643.50
4. Step 4: Simplify right side
   5,139.50x = 113,284,092.25
5. Step 5: Solve for x
   x = 113,284,092.25/5,139.50
6. Step 6: Final answer
   x = 22,041.85