Finding the Third Proportional to 61,207.50 and 86,646.75

Step by Step Solution

1. Step 1: Write the proportion equation
   61,207.50 : 86,646.75 = 86,646.75 : x
2. Step 2: Convert to fraction form
   61,207.50/86,646.75 = 86,646.75/x
3. Step 3: Cross multiply
   61,207.50x = 86,646.75 × 86,646.75
4. Step 4: Simplify right side
   61,207.50x = 7,507,659,285.56
5. Step 5: Solve for x
   x = 7,507,659,285.56/61,207.50
6. Step 6: Final answer
   x = 122,659.14