Finding the Fourth Proportional to 1,479.34, 2,219.34 and 439.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,479.34 : 2,219.34 = 439.42 : x
2. Step 2: Convert to fraction form
   1,479.34/2,219.34 = 439.42/x
3. Step 3: Cross multiply
   1,479.34x = 2,219.34 × 439.42
4. Step 4: Simplify right side
   1,479.34x = 975,222.38
5. Step 5: Solve for x
   x = 975,222.38/1,479.34
6. Step 6: Final answer
   x = 659.23