Finding the Third Proportional to 99,389 and 215,608

Step by Step Solution

1. Step 1: Write the proportion equation
   99,389 : 215,608 = 215,608 : x
2. Step 2: Convert to fraction form
   99,389/215,608 = 215,608/x
3. Step 3: Cross multiply
   99,389x = 215,608 × 215,608
4. Step 4: Simplify right side
   99,389x = 46,486,809,664
5. Step 5: Solve for x
   x = 46,486,809,664/99,389
6. Step 6: Final answer
   x = 467,725.90