Finding the Third Proportional to 68,790.75 and 91,729.78

Step by Step Solution

1. Step 1: Write the proportion equation
   68,790.75 : 91,729.78 = 91,729.78 : x
2. Step 2: Convert to fraction form
   68,790.75/91,729.78 = 91,729.78/x
3. Step 3: Cross multiply
   68,790.75x = 91,729.78 × 91,729.78
4. Step 4: Simplify right side
   68,790.75x = 8,414,352,768.17
5. Step 5: Solve for x
   x = 8,414,352,768.17/68,790.75
6. Step 6: Final answer
   x = 122,318.08