Finding the Fourth Proportional to 1,287.69, 1,929.71 and 740.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.69 : 1,929.71 = 740.03 : x
2. Step 2: Convert to fraction form
   1,287.69/1,929.71 = 740.03/x
3. Step 3: Cross multiply
   1,287.69x = 1,929.71 × 740.03
4. Step 4: Simplify right side
   1,287.69x = 1,428,029.94
5. Step 5: Solve for x
   x = 1,428,029.94/1,287.69
6. Step 6: Final answer
   x = 1,108.99