Finding the Third Proportional to 3,939,591 and 8,626,521

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939,591 : 8,626,521 = 8,626,521 : x
2. Step 2: Convert to fraction form
   3,939,591/8,626,521 = 8,626,521/x
3. Step 3: Cross multiply
   3,939,591x = 8,626,521 × 8,626,521
4. Step 4: Simplify right side
   3,939,591x = 74,416,864,563,441
5. Step 5: Solve for x
   x = 74,416,864,563,441/3,939,591
6. Step 6: Final answer
   x = 18,889,489.94