Finding the Fourth Proportional to 1,153.61, 1,591.97 and 681.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.61 : 1,591.97 = 681.50 : x
2. Step 2: Convert to fraction form
   1,153.61/1,591.97 = 681.50/x
3. Step 3: Cross multiply
   1,153.61x = 1,591.97 × 681.50
4. Step 4: Simplify right side
   1,153.61x = 1,084,924.15
5. Step 5: Solve for x
   x = 1,084,924.15/1,153.61
6. Step 6: Final answer
   x = 940.46