Finding the Third Proportional to 3,998,580 and 8,707,080

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998,580 : 8,707,080 = 8,707,080 : x
2. Step 2: Convert to fraction form
   3,998,580/8,707,080 = 8,707,080/x
3. Step 3: Cross multiply
   3,998,580x = 8,707,080 × 8,707,080
4. Step 4: Simplify right side
   3,998,580x = 75,813,242,126,400
5. Step 5: Solve for x
   x = 75,813,242,126,400/3,998,580
6. Step 6: Final answer
   x = 18,960,041.35