Finding the Third Proportional to 68,905.69 and 73,651.78

Step by Step Solution

1. Step 1: Write the proportion equation
   68,905.69 : 73,651.78 = 73,651.78 : x
2. Step 2: Convert to fraction form
   68,905.69/73,651.78 = 73,651.78/x
3. Step 3: Cross multiply
   68,905.69x = 73,651.78 × 73,651.78
4. Step 4: Simplify right side
   68,905.69x = 5,424,584,881.30
5. Step 5: Solve for x
   x = 5,424,584,881.30/68,905.69
6. Step 6: Final answer
   x = 78,724.78