Finding the Third Proportional to 30,621.75 and 65,617.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,621.75 : 65,617.31 = 65,617.31 : x
2. Step 2: Convert to fraction form
   30,621.75/65,617.31 = 65,617.31/x
3. Step 3: Cross multiply
   30,621.75x = 65,617.31 × 65,617.31
4. Step 4: Simplify right side
   30,621.75x = 4,305,631,699.72
5. Step 5: Solve for x
   x = 4,305,631,699.72/30,621.75
6. Step 6: Final answer
   x = 140,606.98