Finding the Fourth Proportional to 1,287.50, 1,776.06 and 756.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.50 : 1,776.06 = 756.27 : x
2. Step 2: Convert to fraction form
   1,287.50/1,776.06 = 756.27/x
3. Step 3: Cross multiply
   1,287.50x = 1,776.06 × 756.27
4. Step 4: Simplify right side
   1,287.50x = 1,343,180.90
5. Step 5: Solve for x
   x = 1,343,180.90/1,287.50
6. Step 6: Final answer
   x = 1,043.25