Finding the Third Proportional to 5,128,800 and 8,121,330

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,800 : 8,121,330 = 8,121,330 : x
2. Step 2: Convert to fraction form
   5,128,800/8,121,330 = 8,121,330/x
3. Step 3: Cross multiply
   5,128,800x = 8,121,330 × 8,121,330
4. Step 4: Simplify right side
   5,128,800x = 65,956,000,968,900
5. Step 5: Solve for x
   x = 65,956,000,968,900/5,128,800
6. Step 6: Final answer
   x = 12,859,928.44