Finding the Third Proportional to 5,128,794 and 8,121,322

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,794 : 8,121,322 = 8,121,322 : x
2. Step 2: Convert to fraction form
   5,128,794/8,121,322 = 8,121,322/x
3. Step 3: Cross multiply
   5,128,794x = 8,121,322 × 8,121,322
4. Step 4: Simplify right side
   5,128,794x = 65,955,871,027,684
5. Step 5: Solve for x
   x = 65,955,871,027,684/5,128,794
6. Step 6: Final answer
   x = 12,859,918.15