Finding the Fourth Proportional to 1,100.99, 1,518.93 and 628.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.99 : 1,518.93 = 628.76 : x
2. Step 2: Convert to fraction form
   1,100.99/1,518.93 = 628.76/x
3. Step 3: Cross multiply
   1,100.99x = 1,518.93 × 628.76
4. Step 4: Simplify right side
   1,100.99x = 955,034.83
5. Step 5: Solve for x
   x = 955,034.83/1,100.99
6. Step 6: Final answer
   x = 867.44