Finding the Third Proportional to 5,128,805 and 8,121,338

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,805 : 8,121,338 = 8,121,338 : x
2. Step 2: Convert to fraction form
   5,128,805/8,121,338 = 8,121,338/x
3. Step 3: Cross multiply
   5,128,805x = 8,121,338 × 8,121,338
4. Step 4: Simplify right side
   5,128,805x = 65,956,130,910,244
5. Step 5: Solve for x
   x = 65,956,130,910,244/5,128,805
6. Step 6: Final answer
   x = 12,859,941.24