Finding the Fourth Proportional to 2,088.72, 3,130.36 and 854.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,088.72 : 3,130.36 = 854.72 : x
2. Step 2: Convert to fraction form
   2,088.72/3,130.36 = 854.72/x
3. Step 3: Cross multiply
   2,088.72x = 3,130.36 × 854.72
4. Step 4: Simplify right side
   2,088.72x = 2,675,581.30
5. Step 5: Solve for x
   x = 2,675,581.30/2,088.72
6. Step 6: Final answer
   x = 1,280.97