Finding the Third Proportional to 20,899.50 and 42,339

Step by Step Solution

1. Step 1: Write the proportion equation
   20,899.50 : 42,339 = 42,339 : x
2. Step 2: Convert to fraction form
   20,899.50/42,339 = 42,339/x
3. Step 3: Cross multiply
   20,899.50x = 42,339 × 42,339
4. Step 4: Simplify right side
   20,899.50x = 1,792,590,921
5. Step 5: Solve for x
   x = 1,792,590,921/20,899.50
6. Step 6: Final answer
   x = 85,771.95