Finding the Fourth Proportional to 2,335.71, 3,223.15 and 1,392.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,335.71 : 3,223.15 = 1,392.57 : x
2. Step 2: Convert to fraction form
   2,335.71/3,223.15 = 1,392.57/x
3. Step 3: Cross multiply
   2,335.71x = 3,223.15 × 1,392.57
4. Step 4: Simplify right side
   2,335.71x = 4,488,458.51
5. Step 5: Solve for x
   x = 4,488,458.51/2,335.71
6. Step 6: Final answer
   x = 1,921.67