Finding the Fourth Proportional to 1,488.93, 2,231.56 and 838.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.93 : 2,231.56 = 838.29 : x
2. Step 2: Convert to fraction form
   1,488.93/2,231.56 = 838.29/x
3. Step 3: Cross multiply
   1,488.93x = 2,231.56 × 838.29
4. Step 4: Simplify right side
   1,488.93x = 1,870,694.43
5. Step 5: Solve for x
   x = 1,870,694.43/1,488.93
6. Step 6: Final answer
   x = 1,256.40