Finding the Third Proportional to 20,275.31 and 42,828.75

Step by Step Solution

1. Step 1: Write the proportion equation
   20,275.31 : 42,828.75 = 42,828.75 : x
2. Step 2: Convert to fraction form
   20,275.31/42,828.75 = 42,828.75/x
3. Step 3: Cross multiply
   20,275.31x = 42,828.75 × 42,828.75
4. Step 4: Simplify right side
   20,275.31x = 1,834,301,826.56
5. Step 5: Solve for x
   x = 1,834,301,826.56/20,275.31
6. Step 6: Final answer
   x = 90,469.72