Finding the Third Proportional to 4,172,012 and 8,663,768

Step by Step Solution

1. Step 1: Write the proportion equation
   4,172,012 : 8,663,768 = 8,663,768 : x
2. Step 2: Convert to fraction form
   4,172,012/8,663,768 = 8,663,768/x
3. Step 3: Cross multiply
   4,172,012x = 8,663,768 × 8,663,768
4. Step 4: Simplify right side
   4,172,012x = 75,060,875,957,824
5. Step 5: Solve for x
   x = 75,060,875,957,824/4,172,012
6. Step 6: Final answer
   x = 17,991,529.26