Finding the Fourth Proportional to 1,100.80, 1,519.06 and 628.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.80 : 1,519.06 = 628.72 : x
2. Step 2: Convert to fraction form
   1,100.80/1,519.06 = 628.72/x
3. Step 3: Cross multiply
   1,100.80x = 1,519.06 × 628.72
4. Step 4: Simplify right side
   1,100.80x = 955,063.40
5. Step 5: Solve for x
   x = 955,063.40/1,100.80
6. Step 6: Final answer
   x = 867.61