Finding the Third Proportional to 5,509,878 and 12,866,466

Step by Step Solution

1. Step 1: Write the proportion equation
   5,509,878 : 12,866,466 = 12,866,466 : x
2. Step 2: Convert to fraction form
   5,509,878/12,866,466 = 12,866,466/x
3. Step 3: Cross multiply
   5,509,878x = 12,866,466 × 12,866,466
4. Step 4: Simplify right side
   5,509,878x = 165,545,947,329,156
5. Step 5: Solve for x
   x = 165,545,947,329,156/5,509,878
6. Step 6: Final answer
   x = 30,045,301.79