Finding the Third Proportional to 5,218,028 and 7,210,142

Step by Step Solution

1. Step 1: Write the proportion equation
   5,218,028 : 7,210,142 = 7,210,142 : x
2. Step 2: Convert to fraction form
   5,218,028/7,210,142 = 7,210,142/x
3. Step 3: Cross multiply
   5,218,028x = 7,210,142 × 7,210,142
4. Step 4: Simplify right side
   5,218,028x = 51,986,147,660,164
5. Step 5: Solve for x
   x = 51,986,147,660,164/5,218,028
6. Step 6: Final answer
   x = 9,962,795.84