Finding the Third Proportional to 99,915 and 209,068

Step by Step Solution

1. Step 1: Write the proportion equation
   99,915 : 209,068 = 209,068 : x
2. Step 2: Convert to fraction form
   99,915/209,068 = 209,068/x
3. Step 3: Cross multiply
   99,915x = 209,068 × 209,068
4. Step 4: Simplify right side
   99,915x = 43,709,428,624
5. Step 5: Solve for x
   x = 43,709,428,624/99,915
6. Step 6: Final answer
   x = 437,466.13