Finding the Fourth Proportional to 1,488.69, 2,233.17 and 839.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.69 : 2,233.17 = 839.07 : x
2. Step 2: Convert to fraction form
   1,488.69/2,233.17 = 839.07/x
3. Step 3: Cross multiply
   1,488.69x = 2,233.17 × 839.07
4. Step 4: Simplify right side
   1,488.69x = 1,873,785.95
5. Step 5: Solve for x
   x = 1,873,785.95/1,488.69
6. Step 6: Final answer
   x = 1,258.68