Finding the Third Proportional to 99,216 and 215,208

Step by Step Solution

1. Step 1: Write the proportion equation
   99,216 : 215,208 = 215,208 : x
2. Step 2: Convert to fraction form
   99,216/215,208 = 215,208/x
3. Step 3: Cross multiply
   99,216x = 215,208 × 215,208
4. Step 4: Simplify right side
   99,216x = 46,314,483,264
5. Step 5: Solve for x
   x = 46,314,483,264/99,216
6. Step 6: Final answer
   x = 466,804.58