Finding the Third Proportional to 4,142,991 and 8,861,664

Step by Step Solution

1. Step 1: Write the proportion equation
   4,142,991 : 8,861,664 = 8,861,664 : x
2. Step 2: Convert to fraction form
   4,142,991/8,861,664 = 8,861,664/x
3. Step 3: Cross multiply
   4,142,991x = 8,861,664 × 8,861,664
4. Step 4: Simplify right side
   4,142,991x = 78,529,088,848,896
5. Step 5: Solve for x
   x = 78,529,088,848,896/4,142,991
6. Step 6: Final answer
   x = 18,954,684.88