Finding the Fourth Proportional to 1,153.35, 1,591.71 and 656.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.35 : 1,591.71 = 656.15 : x
2. Step 2: Convert to fraction form
   1,153.35/1,591.71 = 656.15/x
3. Step 3: Cross multiply
   1,153.35x = 1,591.71 × 656.15
4. Step 4: Simplify right side
   1,153.35x = 1,044,392.47
5. Step 5: Solve for x
   x = 1,044,392.47/1,153.35
6. Step 6: Final answer
   x = 905.53