Finding the Fourth Proportional to 2,588.76, 3,879.50 and 1,856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,588.76 : 3,879.50 = 1,856.72 : x
2. Step 2: Convert to fraction form
   2,588.76/3,879.50 = 1,856.72/x
3. Step 3: Cross multiply
   2,588.76x = 3,879.50 × 1,856.72
4. Step 4: Simplify right side
   2,588.76x = 7,203,145.66
5. Step 5: Solve for x
   x = 7,203,145.66/2,588.76
6. Step 6: Final answer
   x = 2,782.47