Finding the Third Proportional to 4,200,921 and 9,215,076

Step by Step Solution

1. Step 1: Write the proportion equation
   4,200,921 : 9,215,076 = 9,215,076 : x
2. Step 2: Convert to fraction form
   4,200,921/9,215,076 = 9,215,076/x
3. Step 3: Cross multiply
   4,200,921x = 9,215,076 × 9,215,076
4. Step 4: Simplify right side
   4,200,921x = 84,917,625,685,776
5. Step 5: Solve for x
   x = 84,917,625,685,776/4,200,921
6. Step 6: Final answer
   x = 20,214,049.65