Finding the Fourth Proportional to 2,385.29, 3,578.91 and 1,288.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.29 : 3,578.91 = 1,288.36 : x
2. Step 2: Convert to fraction form
   2,385.29/3,578.91 = 1,288.36/x
3. Step 3: Cross multiply
   2,385.29x = 3,578.91 × 1,288.36
4. Step 4: Simplify right side
   2,385.29x = 4,610,906.59
5. Step 5: Solve for x
   x = 4,610,906.59/2,385.29
6. Step 6: Final answer
   x = 1,933.06