Finding the Fourth Proportional to 1,479.72, 2,217.72 and 699.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,479.72 : 2,217.72 = 699.72 : x
2. Step 2: Convert to fraction form
   1,479.72/2,217.72 = 699.72/x
3. Step 3: Cross multiply
   1,479.72x = 2,217.72 × 699.72
4. Step 4: Simplify right side
   1,479.72x = 1,551,783.04
5. Step 5: Solve for x
   x = 1,551,783.04/1,479.72
6. Step 6: Final answer
   x = 1,048.70