Finding the Third Proportional to 10,015.31 and 20,638.13

Step by Step Solution

1. Step 1: Write the proportion equation
   10,015.31 : 20,638.13 = 20,638.13 : x
2. Step 2: Convert to fraction form
   10,015.31/20,638.13 = 20,638.13/x
3. Step 3: Cross multiply
   10,015.31x = 20,638.13 × 20,638.13
4. Step 4: Simplify right side
   10,015.31x = 425,932,203.52
5. Step 5: Solve for x
   x = 425,932,203.52/10,015.31
6. Step 6: Final answer
   x = 42,528.10