Finding the Fourth Proportional to 1,087.81, 1,501.94 and 960.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.81 : 1,501.94 = 960.80 : x
2. Step 2: Convert to fraction form
   1,087.81/1,501.94 = 960.80/x
3. Step 3: Cross multiply
   1,087.81x = 1,501.94 × 960.80
4. Step 4: Simplify right side
   1,087.81x = 1,443,061.89
5. Step 5: Solve for x
   x = 1,443,061.89/1,087.81
6. Step 6: Final answer
   x = 1,326.58