Finding the Third Proportional to 5,128,804 and 8,121,336

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,804 : 8,121,336 = 8,121,336 : x
2. Step 2: Convert to fraction form
   5,128,804/8,121,336 = 8,121,336/x
3. Step 3: Cross multiply
   5,128,804x = 8,121,336 × 8,121,336
4. Step 4: Simplify right side
   5,128,804x = 65,956,098,424,896
5. Step 5: Solve for x
   x = 65,956,098,424,896/5,128,804
6. Step 6: Final answer
   x = 12,859,937.41