Finding the Fourth Proportional to 1,609.32, 2,219.72 and 979.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.32 : 2,219.72 = 979.40 : x
2. Step 2: Convert to fraction form
   1,609.32/2,219.72 = 979.40/x
3. Step 3: Cross multiply
   1,609.32x = 2,219.72 × 979.40
4. Step 4: Simplify right side
   1,609.32x = 2,173,993.77
5. Step 5: Solve for x
   x = 2,173,993.77/1,609.32
6. Step 6: Final answer
   x = 1,350.88