Finding the Fourth Proportional to 2,639,131.20, 3,642,019.20 and 1,431,907.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639,131.20 : 3,642,019.20 = 1,431,907.20 : x
2. Step 2: Convert to fraction form
   2,639,131.20/3,642,019.20 = 1,431,907.20/x
3. Step 3: Cross multiply
   2,639,131.20x = 3,642,019.20 × 1,431,907.20
4. Step 4: Simplify right side
   2,639,131.20x = 5,215,033,515,018.24
5. Step 5: Solve for x
   x = 5,215,033,515,018.24/2,639,131.20
6. Step 6: Final answer
   x = 1,976,041.78