Finding the Third Proportional to 5,128,786 and 8,121,310

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,786 : 8,121,310 = 8,121,310 : x
2. Step 2: Convert to fraction form
   5,128,786/8,121,310 = 8,121,310/x
3. Step 3: Cross multiply
   5,128,786x = 8,121,310 × 8,121,310
4. Step 4: Simplify right side
   5,128,786x = 65,955,676,116,100
5. Step 5: Solve for x
   x = 65,955,676,116,100/5,128,786
6. Step 6: Final answer
   x = 12,859,900.20