Finding the Fourth Proportional to 2,385.58, 3,292.04 and 1,390.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.58 : 3,292.04 = 1,390.79 : x
2. Step 2: Convert to fraction form
   2,385.58/3,292.04 = 1,390.79/x
3. Step 3: Cross multiply
   2,385.58x = 3,292.04 × 1,390.79
4. Step 4: Simplify right side
   2,385.58x = 4,578,537.52
5. Step 5: Solve for x
   x = 4,578,537.52/2,385.58
6. Step 6: Final answer
   x = 1,919.26