Finding the Fourth Proportional to 1,153.02, 1,591.37 and 680.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.02 : 1,591.37 = 680.88 : x
2. Step 2: Convert to fraction form
   1,153.02/1,591.37 = 680.88/x
3. Step 3: Cross multiply
   1,153.02x = 1,591.37 × 680.88
4. Step 4: Simplify right side
   1,153.02x = 1,083,532.01
5. Step 5: Solve for x
   x = 1,083,532.01/1,153.02
6. Step 6: Final answer
   x = 939.73