Finding the Fourth Proportional to 1,619.33, 2,234.59 and 989.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,619.33 : 2,234.59 = 989.73 : x
2. Step 2: Convert to fraction form
   1,619.33/2,234.59 = 989.73/x
3. Step 3: Cross multiply
   1,619.33x = 2,234.59 × 989.73
4. Step 4: Simplify right side
   1,619.33x = 2,211,638.29
5. Step 5: Solve for x
   x = 2,211,638.29/1,619.33
6. Step 6: Final answer
   x = 1,365.78