Finding the Third Proportional to 3,899,520 and 8,415,588

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899,520 : 8,415,588 = 8,415,588 : x
2. Step 2: Convert to fraction form
   3,899,520/8,415,588 = 8,415,588/x
3. Step 3: Cross multiply
   3,899,520x = 8,415,588 × 8,415,588
4. Step 4: Simplify right side
   3,899,520x = 70,822,121,385,744
5. Step 5: Solve for x
   x = 70,822,121,385,744/3,899,520
6. Step 6: Final answer
   x = 18,161,753.60