Finding the Fourth Proportional to 1,100.53, 1,518.77 and 628.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.53 : 1,518.77 = 628.50 : x
2. Step 2: Convert to fraction form
   1,100.53/1,518.77 = 628.50/x
3. Step 3: Cross multiply
   1,100.53x = 1,518.77 × 628.50
4. Step 4: Simplify right side
   1,100.53x = 954,548.52
5. Step 5: Solve for x
   x = 954,548.52/1,100.53
6. Step 6: Final answer
   x = 867.36