Finding the Third Proportional to 3,785,978 and 8,210,740

Step by Step Solution

1. Step 1: Write the proportion equation
   3,785,978 : 8,210,740 = 8,210,740 : x
2. Step 2: Convert to fraction form
   3,785,978/8,210,740 = 8,210,740/x
3. Step 3: Cross multiply
   3,785,978x = 8,210,740 × 8,210,740
4. Step 4: Simplify right side
   3,785,978x = 67,416,251,347,600
5. Step 5: Solve for x
   x = 67,416,251,347,600/3,785,978
6. Step 6: Final answer
   x = 17,806,825.96