Finding the Third Proportional to 31,212 and 68,853.38

Step by Step Solution

1. Step 1: Write the proportion equation
   31,212 : 68,853.38 = 68,853.38 : x
2. Step 2: Convert to fraction form
   31,212/68,853.38 = 68,853.38/x
3. Step 3: Cross multiply
   31,212x = 68,853.38 × 68,853.38
4. Step 4: Simplify right side
   31,212x = 4,740,787,248.89
5. Step 5: Solve for x
   x = 4,740,787,248.89/31,212
6. Step 6: Final answer
   x = 151,889.89