Finding the Third Proportional to 31,129.25 and 68,799.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,129.25 : 68,799.75 = 68,799.75 : x
2. Step 2: Convert to fraction form
   31,129.25/68,799.75 = 68,799.75/x
3. Step 3: Cross multiply
   31,129.25x = 68,799.75 × 68,799.75
4. Step 4: Simplify right side
   31,129.25x = 4,733,405,600.06
5. Step 5: Solve for x
   x = 4,733,405,600.06/31,129.25
6. Step 6: Final answer
   x = 152,056.53