Finding the Third Proportional to 4,009,778 and 8,645,500

Step by Step Solution

1. Step 1: Write the proportion equation
   4,009,778 : 8,645,500 = 8,645,500 : x
2. Step 2: Convert to fraction form
   4,009,778/8,645,500 = 8,645,500/x
3. Step 3: Cross multiply
   4,009,778x = 8,645,500 × 8,645,500
4. Step 4: Simplify right side
   4,009,778x = 74,744,670,250,000
5. Step 5: Solve for x
   x = 74,744,670,250,000/4,009,778
6. Step 6: Final answer
   x = 18,640,600.61