Finding the Fourth Proportional to 2,385.82, 3,292.10 and 1,390.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.82 : 3,292.10 = 1,390.33 : x
2. Step 2: Convert to fraction form
   2,385.82/3,292.10 = 1,390.33/x
3. Step 3: Cross multiply
   2,385.82x = 3,292.10 × 1,390.33
4. Step 4: Simplify right side
   2,385.82x = 4,577,105.39
5. Step 5: Solve for x
   x = 4,577,105.39/2,385.82
6. Step 6: Final answer
   x = 1,918.46