Finding the Fourth Proportional to 1,088.72, 1,633.82 and 439.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.72 : 1,633.82 = 439.50 : x
2. Step 2: Convert to fraction form
   1,088.72/1,633.82 = 439.50/x
3. Step 3: Cross multiply
   1,088.72x = 1,633.82 × 439.50
4. Step 4: Simplify right side
   1,088.72x = 718,063.89
5. Step 5: Solve for x
   x = 718,063.89/1,088.72
6. Step 6: Final answer
   x = 659.55