Finding the Fourth Proportional to 1,100.79, 1,519.23 and 628.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.79 : 1,519.23 = 628.59 : x
2. Step 2: Convert to fraction form
   1,100.79/1,519.23 = 628.59/x
3. Step 3: Cross multiply
   1,100.79x = 1,519.23 × 628.59
4. Step 4: Simplify right side
   1,100.79x = 954,980.84
5. Step 5: Solve for x
   x = 954,980.84/1,100.79
6. Step 6: Final answer
   x = 867.54