Finding the Fourth Proportional to 2,339.79, 3,228.90 and 1,345.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,339.79 : 3,228.90 = 1,345.25 : x
2. Step 2: Convert to fraction form
   2,339.79/3,228.90 = 1,345.25/x
3. Step 3: Cross multiply
   2,339.79x = 3,228.90 × 1,345.25
4. Step 4: Simplify right side
   2,339.79x = 4,343,661.58
5. Step 5: Solve for x
   x = 4,343,661.58/2,339.79
6. Step 6: Final answer
   x = 1,856.43