Finding the Third Proportional to 3,558,978 and 8,391,222

Step by Step Solution

1. Step 1: Write the proportion equation
   3,558,978 : 8,391,222 = 8,391,222 : x
2. Step 2: Convert to fraction form
   3,558,978/8,391,222 = 8,391,222/x
3. Step 3: Cross multiply
   3,558,978x = 8,391,222 × 8,391,222
4. Step 4: Simplify right side
   3,558,978x = 70,412,606,653,284
5. Step 5: Solve for x
   x = 70,412,606,653,284/3,558,978
6. Step 6: Final answer
   x = 19,784,501.80