Finding the Third Proportional to 3,931,366 and 8,409,226

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931,366 : 8,409,226 = 8,409,226 : x
2. Step 2: Convert to fraction form
   3,931,366/8,409,226 = 8,409,226/x
3. Step 3: Cross multiply
   3,931,366x = 8,409,226 × 8,409,226
4. Step 4: Simplify right side
   3,931,366x = 70,715,081,919,076
5. Step 5: Solve for x
   x = 70,715,081,919,076/3,931,366
6. Step 6: Final answer
   x = 17,987,407.41