Finding the Third Proportional to 31,688.72 and 67,417.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,688.72 : 67,417.31 = 67,417.31 : x
2. Step 2: Convert to fraction form
   31,688.72/67,417.31 = 67,417.31/x
3. Step 3: Cross multiply
   31,688.72x = 67,417.31 × 67,417.31
4. Step 4: Simplify right side
   31,688.72x = 4,545,094,024.72
5. Step 5: Solve for x
   x = 4,545,094,024.72/31,688.72
6. Step 6: Final answer
   x = 143,429.40