Finding the Fourth Proportional to 3,128.45, 4,691.18 and 1,152.73

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.45 : 4,691.18 = 1,152.73 : x
2. Step 2: Convert to fraction form
   3,128.45/4,691.18 = 1,152.73/x
3. Step 3: Cross multiply
   3,128.45x = 4,691.18 × 1,152.73
4. Step 4: Simplify right side
   3,128.45x = 5,407,634.70
5. Step 5: Solve for x
   x = 5,407,634.70/3,128.45
6. Step 6: Final answer
   x = 1,728.53