Finding the Third Proportional to 99,603 and 215,800

Step by Step Solution

1. Step 1: Write the proportion equation
   99,603 : 215,800 = 215,800 : x
2. Step 2: Convert to fraction form
   99,603/215,800 = 215,800/x
3. Step 3: Cross multiply
   99,603x = 215,800 × 215,800
4. Step 4: Simplify right side
   99,603x = 46,569,640,000
5. Step 5: Solve for x
   x = 46,569,640,000/99,603
6. Step 6: Final answer
   x = 467,552.58