Finding the Fourth Proportional to 2,086.83, 3,130.57 and 990.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.83 : 3,130.57 = 990.59 : x
2. Step 2: Convert to fraction form
   2,086.83/3,130.57 = 990.59/x
3. Step 3: Cross multiply
   2,086.83x = 3,130.57 × 990.59
4. Step 4: Simplify right side
   2,086.83x = 3,101,111.34
5. Step 5: Solve for x
   x = 3,101,111.34/2,086.83
6. Step 6: Final answer
   x = 1,486.04