Finding the Fourth Proportional to 2,081.16, 3,122.28 and 985.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.16 : 3,122.28 = 985.50 : x
2. Step 2: Convert to fraction form
   2,081.16/3,122.28 = 985.50/x
3. Step 3: Cross multiply
   2,081.16x = 3,122.28 × 985.50
4. Step 4: Simplify right side
   2,081.16x = 3,077,006.94
5. Step 5: Solve for x
   x = 3,077,006.94/2,081.16
6. Step 6: Final answer
   x = 1,478.51