Finding the Third Proportional to 3,920,872 and 8,493,129

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920,872 : 8,493,129 = 8,493,129 : x
2. Step 2: Convert to fraction form
   3,920,872/8,493,129 = 8,493,129/x
3. Step 3: Cross multiply
   3,920,872x = 8,493,129 × 8,493,129
4. Step 4: Simplify right side
   3,920,872x = 72,133,240,210,641
5. Step 5: Solve for x
   x = 72,133,240,210,641/3,920,872
6. Step 6: Final answer
   x = 18,397,244.34