Finding the Third Proportional to 5,403,391 and 8,216,488

Step by Step Solution

1. Step 1: Write the proportion equation
   5,403,391 : 8,216,488 = 8,216,488 : x
2. Step 2: Convert to fraction form
   5,403,391/8,216,488 = 8,216,488/x
3. Step 3: Cross multiply
   5,403,391x = 8,216,488 × 8,216,488
4. Step 4: Simplify right side
   5,403,391x = 67,510,675,054,144
5. Step 5: Solve for x
   x = 67,510,675,054,144/5,403,391
6. Step 6: Final answer
   x = 12,494,131.01