Finding the Fourth Proportional to 2,976.31, 4,105.78 and 1,928.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,976.31 : 4,105.78 = 1,928.17 : x
2. Step 2: Convert to fraction form
   2,976.31/4,105.78 = 1,928.17/x
3. Step 3: Cross multiply
   2,976.31x = 4,105.78 × 1,928.17
4. Step 4: Simplify right side
   2,976.31x = 7,916,641.82
5. Step 5: Solve for x
   x = 7,916,641.82/2,976.31
6. Step 6: Final answer
   x = 2,659.88