Finding the Fourth Proportional to 2,155.78, 3,234.17 and 1,058.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.78 : 3,234.17 = 1,058.87 : x
2. Step 2: Convert to fraction form
   2,155.78/3,234.17 = 1,058.87/x
3. Step 3: Cross multiply
   2,155.78x = 3,234.17 × 1,058.87
4. Step 4: Simplify right side
   2,155.78x = 3,424,565.59
5. Step 5: Solve for x
   x = 3,424,565.59/2,155.78
6. Step 6: Final answer
   x = 1,588.55