Finding the Third Proportional to 18,621 and 42,542.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,621 : 42,542.50 = 42,542.50 : x
2. Step 2: Convert to fraction form
   18,621/42,542.50 = 42,542.50/x
3. Step 3: Cross multiply
   18,621x = 42,542.50 × 42,542.50
4. Step 4: Simplify right side
   18,621x = 1,809,864,306.25
5. Step 5: Solve for x
   x = 1,809,864,306.25/18,621
6. Step 6: Final answer
   x = 97,194.80