Finding the Fourth Proportional to 1,287.07, 1,776.06 and 755.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.07 : 1,776.06 = 755.98 : x
2. Step 2: Convert to fraction form
   1,287.07/1,776.06 = 755.98/x
3. Step 3: Cross multiply
   1,287.07x = 1,776.06 × 755.98
4. Step 4: Simplify right side
   1,287.07x = 1,342,661.40
5. Step 5: Solve for x
   x = 1,342,661.40/1,287.07
6. Step 6: Final answer
   x = 1,043.19