Finding the Fourth Proportional to 1,100.89, 1,519.32 and 628.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.89 : 1,519.32 = 628.80 : x
2. Step 2: Convert to fraction form
   1,100.89/1,519.32 = 628.80/x
3. Step 3: Cross multiply
   1,100.89x = 1,519.32 × 628.80
4. Step 4: Simplify right side
   1,100.89x = 955,348.42
5. Step 5: Solve for x
   x = 955,348.42/1,100.89
6. Step 6: Final answer
   x = 867.80