Finding the Third Proportional to 3,931,340 and 8,409,171

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931,340 : 8,409,171 = 8,409,171 : x
2. Step 2: Convert to fraction form
   3,931,340/8,409,171 = 8,409,171/x
3. Step 3: Cross multiply
   3,931,340x = 8,409,171 × 8,409,171
4. Step 4: Simplify right side
   3,931,340x = 70,714,156,907,241
5. Step 5: Solve for x
   x = 70,714,156,907,241/3,931,340
6. Step 6: Final answer
   x = 17,987,291.08