Finding the Third Proportional to 99,216 and 218,185.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,216 : 218,185.88 = 218,185.88 : x
2. Step 2: Convert to fraction form
   99,216/218,185.88 = 218,185.88/x
3. Step 3: Cross multiply
   99,216x = 218,185.88 × 218,185.88
4. Step 4: Simplify right side
   99,216x = 47,605,076,049.52
5. Step 5: Solve for x
   x = 47,605,076,049.52/99,216
6. Step 6: Final answer
   x = 479,812.49