Finding the Fourth Proportional to 2,151.63, 2,963.39 and 1,856.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.63 : 2,963.39 = 1,856.79 : x
2. Step 2: Convert to fraction form
   2,151.63/2,963.39 = 1,856.79/x
3. Step 3: Cross multiply
   2,151.63x = 2,963.39 × 1,856.79
4. Step 4: Simplify right side
   2,151.63x = 5,502,383.63
5. Step 5: Solve for x
   x = 5,502,383.63/2,151.63
6. Step 6: Final answer
   x = 2,557.31