Finding the Third Proportional to 11,722.50 and 18,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,722.50 : 18,643.50 = 18,643.50 : x
2. Step 2: Convert to fraction form
   11,722.50/18,643.50 = 18,643.50/x
3. Step 3: Cross multiply
   11,722.50x = 18,643.50 × 18,643.50
4. Step 4: Simplify right side
   11,722.50x = 347,580,092.25
5. Step 5: Solve for x
   x = 347,580,092.25/11,722.50
6. Step 6: Final answer
   x = 29,650.68