Finding the Third Proportional to 5,388,138 and 8,530,356

Step by Step Solution

1. Step 1: Write the proportion equation
   5,388,138 : 8,530,356 = 8,530,356 : x
2. Step 2: Convert to fraction form
   5,388,138/8,530,356 = 8,530,356/x
3. Step 3: Cross multiply
   5,388,138x = 8,530,356 × 8,530,356
4. Step 4: Simplify right side
   5,388,138x = 72,766,973,486,736
5. Step 5: Solve for x
   x = 72,766,973,486,736/5,388,138
6. Step 6: Final answer
   x = 13,505,031.51