Finding the Fourth Proportional to 1,157.69, 1,736.78 and 663.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,157.69 : 1,736.78 = 663.59 : x
2. Step 2: Convert to fraction form
   1,157.69/1,736.78 = 663.59/x
3. Step 3: Cross multiply
   1,157.69x = 1,736.78 × 663.59
4. Step 4: Simplify right side
   1,157.69x = 1,152,510.86
5. Step 5: Solve for x
   x = 1,152,510.86/1,157.69
6. Step 6: Final answer
   x = 995.52