Finding the Third Proportional to 31,615.31 and 68,808.19

Step by Step Solution

1. Step 1: Write the proportion equation
   31,615.31 : 68,808.19 = 68,808.19 : x
2. Step 2: Convert to fraction form
   31,615.31/68,808.19 = 68,808.19/x
3. Step 3: Cross multiply
   31,615.31x = 68,808.19 × 68,808.19
4. Step 4: Simplify right side
   31,615.31x = 4,734,566,667.04
5. Step 5: Solve for x
   x = 4,734,566,667.04/31,615.31
6. Step 6: Final answer
   x = 149,755.49