Finding the Fourth Proportional to 2,128.86, 3,187.82 and 1,580.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.86 : 3,187.82 = 1,580.28 : x
2. Step 2: Convert to fraction form
   2,128.86/3,187.82 = 1,580.28/x
3. Step 3: Cross multiply
   2,128.86x = 3,187.82 × 1,580.28
4. Step 4: Simplify right side
   2,128.86x = 5,037,648.19
5. Step 5: Solve for x
   x = 5,037,648.19/2,128.86
6. Step 6: Final answer
   x = 2,366.36