Finding the Third Proportional to 31,379.91 and 68,979.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,379.91 : 68,979.09 = 68,979.09 : x
2. Step 2: Convert to fraction form
   31,379.91/68,979.09 = 68,979.09/x
3. Step 3: Cross multiply
   31,379.91x = 68,979.09 × 68,979.09
4. Step 4: Simplify right side
   31,379.91x = 4,758,115,374.57
5. Step 5: Solve for x
   x = 4,758,115,374.57/31,379.91
6. Step 6: Final answer
   x = 151,629.37