Finding the Third Proportional to 91,399 and 141,243

Step by Step Solution

1. Step 1: Write the proportion equation
   91,399 : 141,243 = 141,243 : x
2. Step 2: Convert to fraction form
   91,399/141,243 = 141,243/x
3. Step 3: Cross multiply
   91,399x = 141,243 × 141,243
4. Step 4: Simplify right side
   91,399x = 19,949,585,049
5. Step 5: Solve for x
   x = 19,949,585,049/91,399
6. Step 6: Final answer
   x = 218,269.18