Finding the Fourth Proportional to 2,086.83, 3,130.85 and 992.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.83 : 3,130.85 = 992.12 : x
2. Step 2: Convert to fraction form
   2,086.83/3,130.85 = 992.12/x
3. Step 3: Cross multiply
   2,086.83x = 3,130.85 × 992.12
4. Step 4: Simplify right side
   2,086.83x = 3,106,165.73
5. Step 5: Solve for x
   x = 3,106,165.73/2,086.83
6. Step 6: Final answer
   x = 1,488.46