Finding the Fourth Proportional to 2,155.96, 3,233.96 and 1,387

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.96 : 3,233.96 = 1,387 : x
2. Step 2: Convert to fraction form
   2,155.96/3,233.96 = 1,387/x
3. Step 3: Cross multiply
   2,155.96x = 3,233.96 × 1,387
4. Step 4: Simplify right side
   2,155.96x = 4,485,502.52
5. Step 5: Solve for x
   x = 4,485,502.52/2,155.96
6. Step 6: Final answer
   x = 2,080.51