Finding the Third Proportional to 5,128,800 and 8,121,328

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,800 : 8,121,328 = 8,121,328 : x
2. Step 2: Convert to fraction form
   5,128,800/8,121,328 = 8,121,328/x
3. Step 3: Cross multiply
   5,128,800x = 8,121,328 × 8,121,328
4. Step 4: Simplify right side
   5,128,800x = 65,955,968,483,584
5. Step 5: Solve for x
   x = 65,955,968,483,584/5,128,800
6. Step 6: Final answer
   x = 12,859,922.10