Finding the Fourth Proportional to 2,758.59, 4,128.17 and 1,921.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,758.59 : 4,128.17 = 1,921.59 : x
2. Step 2: Convert to fraction form
   2,758.59/4,128.17 = 1,921.59/x
3. Step 3: Cross multiply
   2,758.59x = 4,128.17 × 1,921.59
4. Step 4: Simplify right side
   2,758.59x = 7,932,640.58
5. Step 5: Solve for x
   x = 7,932,640.58/2,758.59
6. Step 6: Final answer
   x = 2,875.61