Finding the Fourth Proportional to 2,031.12, 3,048.45 and 991.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,031.12 : 3,048.45 = 991.89 : x
2. Step 2: Convert to fraction form
   2,031.12/3,048.45 = 991.89/x
3. Step 3: Cross multiply
   2,031.12x = 3,048.45 × 991.89
4. Step 4: Simplify right side
   2,031.12x = 3,023,727.07
5. Step 5: Solve for x
   x = 3,023,727.07/2,031.12
6. Step 6: Final answer
   x = 1,488.70