Finding the Third Proportional to 4,589,784 and 9,990,216

Step by Step Solution

1. Step 1: Write the proportion equation
   4,589,784 : 9,990,216 = 9,990,216 : x
2. Step 2: Convert to fraction form
   4,589,784/9,990,216 = 9,990,216/x
3. Step 3: Cross multiply
   4,589,784x = 9,990,216 × 9,990,216
4. Step 4: Simplify right side
   4,589,784x = 99,804,415,726,656
5. Step 5: Solve for x
   x = 99,804,415,726,656/4,589,784
6. Step 6: Final answer
   x = 21,744,904.71