Finding the Fourth Proportional to 1,487.69, 2,231.57 and 838.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,487.69 : 2,231.57 = 838.41 : x
2. Step 2: Convert to fraction form
   1,487.69/2,231.57 = 838.41/x
3. Step 3: Cross multiply
   1,487.69x = 2,231.57 × 838.41
4. Step 4: Simplify right side
   1,487.69x = 1,870,955.25
5. Step 5: Solve for x
   x = 1,870,955.25/1,487.69
6. Step 6: Final answer
   x = 1,257.62