Finding the Third Proportional to 31,347 and 68,431.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,347 : 68,431.50 = 68,431.50 : x
2. Step 2: Convert to fraction form
   31,347/68,431.50 = 68,431.50/x
3. Step 3: Cross multiply
   31,347x = 68,431.50 × 68,431.50
4. Step 4: Simplify right side
   31,347x = 4,682,870,192.25
5. Step 5: Solve for x
   x = 4,682,870,192.25/31,347
6. Step 6: Final answer
   x = 149,388.15