Finding the Third Proportional to 3,931,338 and 8,409,167

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931,338 : 8,409,167 = 8,409,167 : x
2. Step 2: Convert to fraction form
   3,931,338/8,409,167 = 8,409,167/x
3. Step 3: Cross multiply
   3,931,338x = 8,409,167 × 8,409,167
4. Step 4: Simplify right side
   3,931,338x = 70,714,089,633,889
5. Step 5: Solve for x
   x = 70,714,089,633,889/3,931,338
6. Step 6: Final answer
   x = 17,987,283.12