Finding the Fourth Proportional to 1,179.72, 1,768.72 and 554.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,179.72 : 1,768.72 = 554.80 : x
2. Step 2: Convert to fraction form
   1,179.72/1,768.72 = 554.80/x
3. Step 3: Cross multiply
   1,179.72x = 1,768.72 × 554.80
4. Step 4: Simplify right side
   1,179.72x = 981,285.86
5. Step 5: Solve for x
   x = 981,285.86/1,179.72
6. Step 6: Final answer
   x = 831.80