Finding the Third Proportional to 72,200 and 111,579

Step by Step Solution

1. Step 1: Write the proportion equation
   72,200 : 111,579 = 111,579 : x
2. Step 2: Convert to fraction form
   72,200/111,579 = 111,579/x
3. Step 3: Cross multiply
   72,200x = 111,579 × 111,579
4. Step 4: Simplify right side
   72,200x = 12,449,873,241
5. Step 5: Solve for x
   x = 12,449,873,241/72,200
6. Step 6: Final answer
   x = 172,435.92