Finding the Fourth Proportional to 2,081.90, 3,123.26 and 985.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.90 : 3,123.26 = 985.67 : x
2. Step 2: Convert to fraction form
   2,081.90/3,123.26 = 985.67/x
3. Step 3: Cross multiply
   2,081.90x = 3,123.26 × 985.67
4. Step 4: Simplify right side
   2,081.90x = 3,078,498.55
5. Step 5: Solve for x
   x = 3,078,498.55/2,081.90
6. Step 6: Final answer
   x = 1,478.69