Finding the Fourth Proportional to 1,281.00, 1,767.78 and 721.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.00 : 1,767.78 = 721.48 : x
2. Step 2: Convert to fraction form
   1,281.00/1,767.78 = 721.48/x
3. Step 3: Cross multiply
   1,281.00x = 1,767.78 × 721.48
4. Step 4: Simplify right side
   1,281.00x = 1,275,411.10
5. Step 5: Solve for x
   x = 1,275,411.10/1,281.00
6. Step 6: Final answer
   x = 995.64