Finding the Third Proportional to 72,191 and 111,569

Step by Step Solution

1. Step 1: Write the proportion equation
   72,191 : 111,569 = 111,569 : x
2. Step 2: Convert to fraction form
   72,191/111,569 = 111,569/x
3. Step 3: Cross multiply
   72,191x = 111,569 × 111,569
4. Step 4: Simplify right side
   72,191x = 12,447,641,761
5. Step 5: Solve for x
   x = 12,447,641,761/72,191
6. Step 6: Final answer
   x = 172,426.50