Finding the Third Proportional to 2,100,421 and 4,580,946

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100,421 : 4,580,946 = 4,580,946 : x
2. Step 2: Convert to fraction form
   2,100,421/4,580,946 = 4,580,946/x
3. Step 3: Cross multiply
   2,100,421x = 4,580,946 × 4,580,946
4. Step 4: Simplify right side
   2,100,421x = 20,985,066,254,916
5. Step 5: Solve for x
   x = 20,985,066,254,916/2,100,421
6. Step 6: Final answer
   x = 9,990,885.76