Finding the Fourth Proportional to 2,153.78, 3,231.17 and 1,056.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.78 : 3,231.17 = 1,056.86 : x
2. Step 2: Convert to fraction form
   2,153.78/3,231.17 = 1,056.86/x
3. Step 3: Cross multiply
   2,153.78x = 3,231.17 × 1,056.86
4. Step 4: Simplify right side
   2,153.78x = 3,414,894.33
5. Step 5: Solve for x
   x = 3,414,894.33/2,153.78
6. Step 6: Final answer
   x = 1,585.54