Finding the Third Proportional to 99,640 and 215,562

Step by Step Solution

1. Step 1: Write the proportion equation
   99,640 : 215,562 = 215,562 : x
2. Step 2: Convert to fraction form
   99,640/215,562 = 215,562/x
3. Step 3: Cross multiply
   99,640x = 215,562 × 215,562
4. Step 4: Simplify right side
   99,640x = 46,466,975,844
5. Step 5: Solve for x
   x = 46,466,975,844/99,640
6. Step 6: Final answer
   x = 466,348.61