Finding the Third Proportional to 34,809.75 and 68,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   34,809.75 : 68,890.50 = 68,890.50 : x
2. Step 2: Convert to fraction form
   34,809.75/68,890.50 = 68,890.50/x
3. Step 3: Cross multiply
   34,809.75x = 68,890.50 × 68,890.50
4. Step 4: Simplify right side
   34,809.75x = 4,745,900,990.25
5. Step 5: Solve for x
   x = 4,745,900,990.25/34,809.75
6. Step 6: Final answer
   x = 136,338.27