Finding the Fourth Proportional to 1,856.88, 2,789.64 and 1,087.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.88 : 2,789.64 = 1,087.92 : x
2. Step 2: Convert to fraction form
   1,856.88/2,789.64 = 1,087.92/x
3. Step 3: Cross multiply
   1,856.88x = 2,789.64 × 1,087.92
4. Step 4: Simplify right side
   1,856.88x = 3,034,905.15
5. Step 5: Solve for x
   x = 3,034,905.15/1,856.88
6. Step 6: Final answer
   x = 1,634.41