Finding the Third Proportional to 99,912 and 210,976

Step by Step Solution

1. Step 1: Write the proportion equation
   99,912 : 210,976 = 210,976 : x
2. Step 2: Convert to fraction form
   99,912/210,976 = 210,976/x
3. Step 3: Cross multiply
   99,912x = 210,976 × 210,976
4. Step 4: Simplify right side
   99,912x = 44,510,872,576
5. Step 5: Solve for x
   x = 44,510,872,576/99,912
6. Step 6: Final answer
   x = 445,500.77