Finding the Fourth Proportional to 1,488.50, 2,055 and 991.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.50 : 2,055 = 991.83 : x
2. Step 2: Convert to fraction form
   1,488.50/2,055 = 991.83/x
3. Step 3: Cross multiply
   1,488.50x = 2,055 × 991.83
4. Step 4: Simplify right side
   1,488.50x = 2,038,210.65
5. Step 5: Solve for x
   x = 2,038,210.65/1,488.50
6. Step 6: Final answer
   x = 1,369.31