Finding the Fourth Proportional to 2,087.80, 3,132.72 and 856.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.80 : 3,132.72 = 856.08 : x
2. Step 2: Convert to fraction form
   2,087.80/3,132.72 = 856.08/x
3. Step 3: Cross multiply
   2,087.80x = 3,132.72 × 856.08
4. Step 4: Simplify right side
   2,087.80x = 2,681,858.94
5. Step 5: Solve for x
   x = 2,681,858.94/2,087.80
6. Step 6: Final answer
   x = 1,284.54