Finding the Fourth Proportional to 1,152.72, 1,729.08 and 659.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.72 : 1,729.08 = 659.28 : x
2. Step 2: Convert to fraction form
   1,152.72/1,729.08 = 659.28/x
3. Step 3: Cross multiply
   1,152.72x = 1,729.08 × 659.28
4. Step 4: Simplify right side
   1,152.72x = 1,139,947.86
5. Step 5: Solve for x
   x = 1,139,947.86/1,152.72
6. Step 6: Final answer
   x = 988.92