Finding the Third Proportional to 20,815.31 and 30,671.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,815.31 : 30,671.72 = 30,671.72 : x
2. Step 2: Convert to fraction form
   20,815.31/30,671.72 = 30,671.72/x
3. Step 3: Cross multiply
   20,815.31x = 30,671.72 × 30,671.72
4. Step 4: Simplify right side
   20,815.31x = 940,754,331.08
5. Step 5: Solve for x
   x = 940,754,331.08/20,815.31
6. Step 6: Final answer
   x = 45,195.30