Finding the Third Proportional to 3,947,129 and 8,503,318

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947,129 : 8,503,318 = 8,503,318 : x
2. Step 2: Convert to fraction form
   3,947,129/8,503,318 = 8,503,318/x
3. Step 3: Cross multiply
   3,947,129x = 8,503,318 × 8,503,318
4. Step 4: Simplify right side
   3,947,129x = 72,306,417,009,124
5. Step 5: Solve for x
   x = 72,306,417,009,124/3,947,129
6. Step 6: Final answer
   x = 18,318,736.73