Finding the Fourth Proportional to 2,478,216.28, 3,419,997.39 and 1,390,568.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478,216.28 : 3,419,997.39 = 1,390,568.30 : x
2. Step 2: Convert to fraction form
   2,478,216.28/3,419,997.39 = 1,390,568.30/x
3. Step 3: Cross multiply
   2,478,216.28x = 3,419,997.39 × 1,390,568.30
4. Step 4: Simplify right side
   2,478,216.28x = 4,755,739,932,563.91
5. Step 5: Solve for x
   x = 4,755,739,932,563.91/2,478,216.28
6. Step 6: Final answer
   x = 1,919,017.31