Finding the Third Proportional to 99,620 and 213,928

Step by Step Solution

1. Step 1: Write the proportion equation
   99,620 : 213,928 = 213,928 : x
2. Step 2: Convert to fraction form
   99,620/213,928 = 213,928/x
3. Step 3: Cross multiply
   99,620x = 213,928 × 213,928
4. Step 4: Simplify right side
   99,620x = 45,765,189,184
5. Step 5: Solve for x
   x = 45,765,189,184/99,620
6. Step 6: Final answer
   x = 459,397.60