Finding the Third Proportional to 31,239 and 68,188.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,239 : 68,188.50 = 68,188.50 : x
2. Step 2: Convert to fraction form
   31,239/68,188.50 = 68,188.50/x
3. Step 3: Cross multiply
   31,239x = 68,188.50 × 68,188.50
4. Step 4: Simplify right side
   31,239x = 4,649,671,532.25
5. Step 5: Solve for x
   x = 4,649,671,532.25/31,239
6. Step 6: Final answer
   x = 148,841.88