Finding the Fourth Proportional to 1,768.56, 2,651.76 and 728.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,768.56 : 2,651.76 = 728.24 : x
2. Step 2: Convert to fraction form
   1,768.56/2,651.76 = 728.24/x
3. Step 3: Cross multiply
   1,768.56x = 2,651.76 × 728.24
4. Step 4: Simplify right side
   1,768.56x = 1,931,117.70
5. Step 5: Solve for x
   x = 1,931,117.70/1,768.56
6. Step 6: Final answer
   x = 1,091.92