Finding the Third Proportional to 31,211.89 and 68,786.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,211.89 : 68,786.09 = 68,786.09 : x
2. Step 2: Convert to fraction form
   31,211.89/68,786.09 = 68,786.09/x
3. Step 3: Cross multiply
   31,211.89x = 68,786.09 × 68,786.09
4. Step 4: Simplify right side
   31,211.89x = 4,731,525,618.60
5. Step 5: Solve for x
   x = 4,731,525,618.60/31,211.89
6. Step 6: Final answer
   x = 151,593.67