Finding the Third Proportional to 4,278,972 and 8,916,504

Step by Step Solution

1. Step 1: Write the proportion equation
   4,278,972 : 8,916,504 = 8,916,504 : x
2. Step 2: Convert to fraction form
   4,278,972/8,916,504 = 8,916,504/x
3. Step 3: Cross multiply
   4,278,972x = 8,916,504 × 8,916,504
4. Step 4: Simplify right side
   4,278,972x = 79,504,043,582,016
5. Step 5: Solve for x
   x = 79,504,043,582,016/4,278,972
6. Step 6: Final answer
   x = 18,580,173.83