Finding the Fourth Proportional to 2,086.07, 3,129.44 and 989.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.07 : 3,129.44 = 989.83 : x
2. Step 2: Convert to fraction form
   2,086.07/3,129.44 = 989.83/x
3. Step 3: Cross multiply
   2,086.07x = 3,129.44 × 989.83
4. Step 4: Simplify right side
   2,086.07x = 3,097,613.60
5. Step 5: Solve for x
   x = 3,097,613.60/2,086.07
6. Step 6: Final answer
   x = 1,484.90