Finding the Third Proportional to 86,584.50 and 138,318

Step by Step Solution

1. Step 1: Write the proportion equation
   86,584.50 : 138,318 = 138,318 : x
2. Step 2: Convert to fraction form
   86,584.50/138,318 = 138,318/x
3. Step 3: Cross multiply
   86,584.50x = 138,318 × 138,318
4. Step 4: Simplify right side
   86,584.50x = 19,131,869,124
5. Step 5: Solve for x
   x = 19,131,869,124/86,584.50
6. Step 6: Final answer
   x = 220,961.82