Finding the Fourth Proportional to 2,128.69, 2,939.03 and 1,569.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.69 : 2,939.03 = 1,569.79 : x
2. Step 2: Convert to fraction form
   2,128.69/2,939.03 = 1,569.79/x
3. Step 3: Cross multiply
   2,128.69x = 2,939.03 × 1,569.79
4. Step 4: Simplify right side
   2,128.69x = 4,613,659.90
5. Step 5: Solve for x
   x = 4,613,659.90/2,128.69
6. Step 6: Final answer
   x = 2,167.37