Finding the Third Proportional to 68,485.50 and 91,608.75

Step by Step Solution

1. Step 1: Write the proportion equation
   68,485.50 : 91,608.75 = 91,608.75 : x
2. Step 2: Convert to fraction form
   68,485.50/91,608.75 = 91,608.75/x
3. Step 3: Cross multiply
   68,485.50x = 91,608.75 × 91,608.75
4. Step 4: Simplify right side
   68,485.50x = 8,392,163,076.56
5. Step 5: Solve for x
   x = 8,392,163,076.56/68,485.50
6. Step 6: Final answer
   x = 122,539.27