Finding the Fourth Proportional to 1,660.50, 2,488.59 and 838.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,660.50 : 2,488.59 = 838.89 : x
2. Step 2: Convert to fraction form
   1,660.50/2,488.59 = 838.89/x
3. Step 3: Cross multiply
   1,660.50x = 2,488.59 × 838.89
4. Step 4: Simplify right side
   1,660.50x = 2,087,653.27
5. Step 5: Solve for x
   x = 2,087,653.27/1,660.50
6. Step 6: Final answer
   x = 1,257.24