Finding the Fourth Proportional to 2,659.05, 3,987.68 and 992.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.05 : 3,987.68 = 992.83 : x
2. Step 2: Convert to fraction form
   2,659.05/3,987.68 = 992.83/x
3. Step 3: Cross multiply
   2,659.05x = 3,987.68 × 992.83
4. Step 4: Simplify right side
   2,659.05x = 3,959,080.88
5. Step 5: Solve for x
   x = 3,959,080.88/2,659.05
6. Step 6: Final answer
   x = 1,488.91