Finding the Fourth Proportional to 2,086.58, 3,127.68 and 990.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.58 : 3,127.68 = 990.14 : x
2. Step 2: Convert to fraction form
   2,086.58/3,127.68 = 990.14/x
3. Step 3: Cross multiply
   2,086.58x = 3,127.68 × 990.14
4. Step 4: Simplify right side
   2,086.58x = 3,096,841.08
5. Step 5: Solve for x
   x = 3,096,841.08/2,086.58
6. Step 6: Final answer
   x = 1,484.17