Finding the Fourth Proportional to 1,100.63, 1,519.49 and 728.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.63 : 1,519.49 = 728.51 : x
2. Step 2: Convert to fraction form
   1,100.63/1,519.49 = 728.51/x
3. Step 3: Cross multiply
   1,100.63x = 1,519.49 × 728.51
4. Step 4: Simplify right side
   1,100.63x = 1,106,957.88
5. Step 5: Solve for x
   x = 1,106,957.88/1,100.63
6. Step 6: Final answer
   x = 1,005.75