Finding the Third Proportional to 4,128,834 and 8,921,970

Step by Step Solution

1. Step 1: Write the proportion equation
   4,128,834 : 8,921,970 = 8,921,970 : x
2. Step 2: Convert to fraction form
   4,128,834/8,921,970 = 8,921,970/x
3. Step 3: Cross multiply
   4,128,834x = 8,921,970 × 8,921,970
4. Step 4: Simplify right side
   4,128,834x = 79,601,548,680,900
5. Step 5: Solve for x
   x = 79,601,548,680,900/4,128,834
6. Step 6: Final answer
   x = 19,279,425.78