Finding the Third Proportional to 3,998,340 and 8,774,820

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998,340 : 8,774,820 = 8,774,820 : x
2. Step 2: Convert to fraction form
   3,998,340/8,774,820 = 8,774,820/x
3. Step 3: Cross multiply
   3,998,340x = 8,774,820 × 8,774,820
4. Step 4: Simplify right side
   3,998,340x = 76,997,466,032,400
5. Step 5: Solve for x
   x = 76,997,466,032,400/3,998,340
6. Step 6: Final answer
   x = 19,257,358.31