Finding the Fourth Proportional to 2,390.85, 3,298.59 and 1,342.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.85 : 3,298.59 = 1,342.71 : x
2. Step 2: Convert to fraction form
   2,390.85/3,298.59 = 1,342.71/x
3. Step 3: Cross multiply
   2,390.85x = 3,298.59 × 1,342.71
4. Step 4: Simplify right side
   2,390.85x = 4,429,049.78
5. Step 5: Solve for x
   x = 4,429,049.78/2,390.85
6. Step 6: Final answer
   x = 1,852.50