Finding the Third Proportional to 31,331.81 and 68,905.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,331.81 : 68,905.69 = 68,905.69 : x
2. Step 2: Convert to fraction form
   31,331.81/68,905.69 = 68,905.69/x
3. Step 3: Cross multiply
   31,331.81x = 68,905.69 × 68,905.69
4. Step 4: Simplify right side
   31,331.81x = 4,747,993,769.85
5. Step 5: Solve for x
   x = 4,747,993,769.85/31,331.81
6. Step 6: Final answer
   x = 151,539.07