Finding the Fourth Proportional to 2,087.06, 3,128.97 and 854.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.06 : 3,128.97 = 854.78 : x
2. Step 2: Convert to fraction form
   2,087.06/3,128.97 = 854.78/x
3. Step 3: Cross multiply
   2,087.06x = 3,128.97 × 854.78
4. Step 4: Simplify right side
   2,087.06x = 2,674,580.98
5. Step 5: Solve for x
   x = 2,674,580.98/2,087.06
6. Step 6: Final answer
   x = 1,281.51