Finding the Third Proportional to 1,511,899 and 2,178,424

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511,899 : 2,178,424 = 2,178,424 : x
2. Step 2: Convert to fraction form
   1,511,899/2,178,424 = 2,178,424/x
3. Step 3: Cross multiply
   1,511,899x = 2,178,424 × 2,178,424
4. Step 4: Simplify right side
   1,511,899x = 4,745,531,123,776
5. Step 5: Solve for x
   x = 4,745,531,123,776/1,511,899
6. Step 6: Final answer
   x = 3,138,788.45