Finding the Third Proportional to 2,179,905 and 5,091,621

Step by Step Solution

1. Step 1: Write the proportion equation
   2,179,905 : 5,091,621 = 5,091,621 : x
2. Step 2: Convert to fraction form
   2,179,905/5,091,621 = 5,091,621/x
3. Step 3: Cross multiply
   2,179,905x = 5,091,621 × 5,091,621
4. Step 4: Simplify right side
   2,179,905x = 25,924,604,407,641
5. Step 5: Solve for x
   x = 25,924,604,407,641/2,179,905
6. Step 6: Final answer
   x = 11,892,538.62