Finding the Third Proportional to 31,719.09 and 68,905.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,719.09 : 68,905.69 = 68,905.69 : x
2. Step 2: Convert to fraction form
   31,719.09/68,905.69 = 68,905.69/x
3. Step 3: Cross multiply
   31,719.09x = 68,905.69 × 68,905.69
4. Step 4: Simplify right side
   31,719.09x = 4,747,993,769.85
5. Step 5: Solve for x
   x = 4,747,993,769.85/31,719.09
6. Step 6: Final answer
   x = 149,688.82