Finding the Third Proportional to 20,242.50 and 42,787.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,242.50 : 42,787.50 = 42,787.50 : x
2. Step 2: Convert to fraction form
   20,242.50/42,787.50 = 42,787.50/x
3. Step 3: Cross multiply
   20,242.50x = 42,787.50 × 42,787.50
4. Step 4: Simplify right side
   20,242.50x = 1,830,770,156.25
5. Step 5: Solve for x
   x = 1,830,770,156.25/20,242.50
6. Step 6: Final answer
   x = 90,441.90