Finding the Third Proportional to 5,128,794 and 8,121,321

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,794 : 8,121,321 = 8,121,321 : x
2. Step 2: Convert to fraction form
   5,128,794/8,121,321 = 8,121,321/x
3. Step 3: Cross multiply
   5,128,794x = 8,121,321 × 8,121,321
4. Step 4: Simplify right side
   5,128,794x = 65,955,854,785,041
5. Step 5: Solve for x
   x = 65,955,854,785,041/5,128,794
6. Step 6: Final answer
   x = 12,859,914.98