Finding the Fourth Proportional to 1,153.34, 1,591.81 and 681.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.34 : 1,591.81 = 681.36 : x
2. Step 2: Convert to fraction form
   1,153.34/1,591.81 = 681.36/x
3. Step 3: Cross multiply
   1,153.34x = 1,591.81 × 681.36
4. Step 4: Simplify right side
   1,153.34x = 1,084,584.30
5. Step 5: Solve for x
   x = 1,084,584.30/1,153.34
6. Step 6: Final answer
   x = 940.39