Finding the Third Proportional to 5,911,486 and 8,909,511

Step by Step Solution

1. Step 1: Write the proportion equation
   5,911,486 : 8,909,511 = 8,909,511 : x
2. Step 2: Convert to fraction form
   5,911,486/8,909,511 = 8,909,511/x
3. Step 3: Cross multiply
   5,911,486x = 8,909,511 × 8,909,511
4. Step 4: Simplify right side
   5,911,486x = 79,379,386,259,121
5. Step 5: Solve for x
   x = 79,379,386,259,121/5,911,486
6. Step 6: Final answer
   x = 13,427,991.92