Finding the Third Proportional to 5,256,808 and 7,678,520

Step by Step Solution

1. Step 1: Write the proportion equation
   5,256,808 : 7,678,520 = 7,678,520 : x
2. Step 2: Convert to fraction form
   5,256,808/7,678,520 = 7,678,520/x
3. Step 3: Cross multiply
   5,256,808x = 7,678,520 × 7,678,520
4. Step 4: Simplify right side
   5,256,808x = 58,959,669,390,400
5. Step 5: Solve for x
   x = 58,959,669,390,400/5,256,808
6. Step 6: Final answer
   x = 11,215,868.91