Finding the Third Proportional to 20,172.50 and 42,744.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,172.50 : 42,744.50 = 42,744.50 : x
2. Step 2: Convert to fraction form
   20,172.50/42,744.50 = 42,744.50/x
3. Step 3: Cross multiply
   20,172.50x = 42,744.50 × 42,744.50
4. Step 4: Simplify right side
   20,172.50x = 1,827,092,280.25
5. Step 5: Solve for x
   x = 1,827,092,280.25/20,172.50
6. Step 6: Final answer
   x = 90,573.42