Finding the Third Proportional to 3,989,560 and 8,776,160

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989,560 : 8,776,160 = 8,776,160 : x
2. Step 2: Convert to fraction form
   3,989,560/8,776,160 = 8,776,160/x
3. Step 3: Cross multiply
   3,989,560x = 8,776,160 × 8,776,160
4. Step 4: Simplify right side
   3,989,560x = 77,020,984,345,600
5. Step 5: Solve for x
   x = 77,020,984,345,600/3,989,560
6. Step 6: Final answer
   x = 19,305,633.79