Finding the Third Proportional to 68,890.50 and 76,681.69

Step by Step Solution

1. Step 1: Write the proportion equation
   68,890.50 : 76,681.69 = 76,681.69 : x
2. Step 2: Convert to fraction form
   68,890.50/76,681.69 = 76,681.69/x
3. Step 3: Cross multiply
   68,890.50x = 76,681.69 × 76,681.69
4. Step 4: Simplify right side
   68,890.50x = 5,880,081,197.85
5. Step 5: Solve for x
   x = 5,880,081,197.85/68,890.50
6. Step 6: Final answer
   x = 85,354.02