Finding the Third Proportional to 3,931,359 and 8,409,210

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931,359 : 8,409,210 = 8,409,210 : x
2. Step 2: Convert to fraction form
   3,931,359/8,409,210 = 8,409,210/x
3. Step 3: Cross multiply
   3,931,359x = 8,409,210 × 8,409,210
4. Step 4: Simplify right side
   3,931,359x = 70,714,812,824,100
5. Step 5: Solve for x
   x = 70,714,812,824,100/3,931,359
6. Step 6: Final answer
   x = 17,987,370.99