Finding the Fourth Proportional to 1,088.72, 1,632.84 and 319.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.72 : 1,632.84 = 319.04 : x
2. Step 2: Convert to fraction form
   1,088.72/1,632.84 = 319.04/x
3. Step 3: Cross multiply
   1,088.72x = 1,632.84 × 319.04
4. Step 4: Simplify right side
   1,088.72x = 520,941.27
5. Step 5: Solve for x
   x = 520,941.27/1,088.72
6. Step 6: Final answer
   x = 478.49