Finding the Third Proportional to 4,200,900 and 8,555,890

Step by Step Solution

1. Step 1: Write the proportion equation
   4,200,900 : 8,555,890 = 8,555,890 : x
2. Step 2: Convert to fraction form
   4,200,900/8,555,890 = 8,555,890/x
3. Step 3: Cross multiply
   4,200,900x = 8,555,890 × 8,555,890
4. Step 4: Simplify right side
   4,200,900x = 73,203,253,692,100
5. Step 5: Solve for x
   x = 73,203,253,692,100/4,200,900
6. Step 6: Final answer
   x = 17,425,612.06