Finding the Fourth Proportional to 2,385.89, 3,292.52 and 1,390.97

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.89 : 3,292.52 = 1,390.97 : x
2. Step 2: Convert to fraction form
   2,385.89/3,292.52 = 1,390.97/x
3. Step 3: Cross multiply
   2,385.89x = 3,292.52 × 1,390.97
4. Step 4: Simplify right side
   2,385.89x = 4,579,808.25
5. Step 5: Solve for x
   x = 4,579,808.25/2,385.89
6. Step 6: Final answer
   x = 1,919.54