Finding the Third Proportional to 5,216,760 and 7,980,740

Step by Step Solution

1. Step 1: Write the proportion equation
   5,216,760 : 7,980,740 = 7,980,740 : x
2. Step 2: Convert to fraction form
   5,216,760/7,980,740 = 7,980,740/x
3. Step 3: Cross multiply
   5,216,760x = 7,980,740 × 7,980,740
4. Step 4: Simplify right side
   5,216,760x = 63,692,210,947,600
5. Step 5: Solve for x
   x = 63,692,210,947,600/5,216,760
6. Step 6: Final answer
   x = 12,209,151.07