Finding the Third Proportional to 10,118.25 and 20,638.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,118.25 : 20,638.55 = 20,638.55 : x
2. Step 2: Convert to fraction form
   10,118.25/20,638.55 = 20,638.55/x
3. Step 3: Cross multiply
   10,118.25x = 20,638.55 × 20,638.55
4. Step 4: Simplify right side
   10,118.25x = 425,949,617.11
5. Step 5: Solve for x
   x = 425,949,617.11/10,118.25
6. Step 6: Final answer
   x = 42,097.16