Finding the Third Proportional to 31,721.63 and 67,665.38

Step by Step Solution

1. Step 1: Write the proportion equation
   31,721.63 : 67,665.38 = 67,665.38 : x
2. Step 2: Convert to fraction form
   31,721.63/67,665.38 = 67,665.38/x
3. Step 3: Cross multiply
   31,721.63x = 67,665.38 × 67,665.38
4. Step 4: Simplify right side
   31,721.63x = 4,578,602,973.89
5. Step 5: Solve for x
   x = 4,578,602,973.89/31,721.63
6. Step 6: Final answer
   x = 144,336.96