Finding the Fourth Proportional to 1,089.06, 1,633.83 and 319.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.06 : 1,633.83 = 319.50 : x
2. Step 2: Convert to fraction form
   1,089.06/1,633.83 = 319.50/x
3. Step 3: Cross multiply
   1,089.06x = 1,633.83 × 319.50
4. Step 4: Simplify right side
   1,089.06x = 522,008.69
5. Step 5: Solve for x
   x = 522,008.69/1,089.06
6. Step 6: Final answer
   x = 479.32