Finding the Third Proportional to 3,931,353 and 8,409,213

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931,353 : 8,409,213 = 8,409,213 : x
2. Step 2: Convert to fraction form
   3,931,353/8,409,213 = 8,409,213/x
3. Step 3: Cross multiply
   3,931,353x = 8,409,213 × 8,409,213
4. Step 4: Simplify right side
   3,931,353x = 70,714,863,279,369
5. Step 5: Solve for x
   x = 70,714,863,279,369/3,931,353
6. Step 6: Final answer
   x = 17,987,411.28