Finding the Third Proportional to 20,439 and 42,734.25

Step by Step Solution

1. Step 1: Write the proportion equation
   20,439 : 42,734.25 = 42,734.25 : x
2. Step 2: Convert to fraction form
   20,439/42,734.25 = 42,734.25/x
3. Step 3: Cross multiply
   20,439x = 42,734.25 × 42,734.25
4. Step 4: Simplify right side
   20,439x = 1,826,216,123.06
5. Step 5: Solve for x
   x = 1,826,216,123.06/20,439
6. Step 6: Final answer
   x = 89,349.58