Finding the Fourth Proportional to 2,439.74, 3,366.85 and 1,320.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.74 : 3,366.85 = 1,320.69 : x
2. Step 2: Convert to fraction form
   2,439.74/3,366.85 = 1,320.69/x
3. Step 3: Cross multiply
   2,439.74x = 3,366.85 × 1,320.69
4. Step 4: Simplify right side
   2,439.74x = 4,446,561.82
5. Step 5: Solve for x
   x = 4,446,561.82/2,439.74
6. Step 6: Final answer
   x = 1,822.55