Finding the Fourth Proportional to 1,287.27, 1,776.42 and 763.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.27 : 1,776.42 = 763.32 : x
2. Step 2: Convert to fraction form
   1,287.27/1,776.42 = 763.32/x
3. Step 3: Cross multiply
   1,287.27x = 1,776.42 × 763.32
4. Step 4: Simplify right side
   1,287.27x = 1,355,976.91
5. Step 5: Solve for x
   x = 1,355,976.91/1,287.27
6. Step 6: Final answer
   x = 1,053.37