Finding the Third Proportional to 4,172,008 and 8,663,756

Step by Step Solution

1. Step 1: Write the proportion equation
   4,172,008 : 8,663,756 = 8,663,756 : x
2. Step 2: Convert to fraction form
   4,172,008/8,663,756 = 8,663,756/x
3. Step 3: Cross multiply
   4,172,008x = 8,663,756 × 8,663,756
4. Step 4: Simplify right side
   4,172,008x = 75,060,668,027,536
5. Step 5: Solve for x
   x = 75,060,668,027,536/4,172,008
6. Step 6: Final answer
   x = 17,991,496.67