Finding the Third Proportional to 68,215.50 and 75,991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   68,215.50 : 75,991.50 = 75,991.50 : x
2. Step 2: Convert to fraction form
   68,215.50/75,991.50 = 75,991.50/x
3. Step 3: Cross multiply
   68,215.50x = 75,991.50 × 75,991.50
4. Step 4: Simplify right side
   68,215.50x = 5,774,708,072.25
5. Step 5: Solve for x
   x = 5,774,708,072.25/68,215.50
6. Step 6: Final answer
   x = 84,653.90