Finding the Fourth Proportional to 2,128.80, 2,939.58 and 1,344.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.80 : 2,939.58 = 1,344.24 : x
2. Step 2: Convert to fraction form
   2,128.80/2,939.58 = 1,344.24/x
3. Step 3: Cross multiply
   2,128.80x = 2,939.58 × 1,344.24
4. Step 4: Simplify right side
   2,128.80x = 3,951,501.02
5. Step 5: Solve for x
   x = 3,951,501.02/2,128.80
6. Step 6: Final answer
   x = 1,856.21