Finding the Third Proportional to 99,900 and 208,980

Step by Step Solution

1. Step 1: Write the proportion equation
   99,900 : 208,980 = 208,980 : x
2. Step 2: Convert to fraction form
   99,900/208,980 = 208,980/x
3. Step 3: Cross multiply
   99,900x = 208,980 × 208,980
4. Step 4: Simplify right side
   99,900x = 43,672,640,400
5. Step 5: Solve for x
   x = 43,672,640,400/99,900
6. Step 6: Final answer
   x = 437,163.57