Finding the Third Proportional to 30,621.38 and 65,616.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,621.38 : 65,616.56 = 65,616.56 : x
2. Step 2: Convert to fraction form
   30,621.38/65,616.56 = 65,616.56/x
3. Step 3: Cross multiply
   30,621.38x = 65,616.56 × 65,616.56
4. Step 4: Simplify right side
   30,621.38x = 4,305,533,274.32
5. Step 5: Solve for x
   x = 4,305,533,274.32/30,621.38
6. Step 6: Final answer
   x = 140,605.48