Finding the Fourth Proportional to 1,153.52, 1,591.56 and 681.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.52 : 1,591.56 = 681.28 : x
2. Step 2: Convert to fraction form
   1,153.52/1,591.56 = 681.28/x
3. Step 3: Cross multiply
   1,153.52x = 1,591.56 × 681.28
4. Step 4: Simplify right side
   1,153.52x = 1,084,298.00
5. Step 5: Solve for x
   x = 1,084,298.00/1,153.52
6. Step 6: Final answer
   x = 939.99