Finding the Third Proportional to 99,426 and 215,790

Step by Step Solution

1. Step 1: Write the proportion equation
   99,426 : 215,790 = 215,790 : x
2. Step 2: Convert to fraction form
   99,426/215,790 = 215,790/x
3. Step 3: Cross multiply
   99,426x = 215,790 × 215,790
4. Step 4: Simplify right side
   99,426x = 46,565,324,100
5. Step 5: Solve for x
   x = 46,565,324,100/99,426
6. Step 6: Final answer
   x = 468,341.52