Finding the Fourth Proportional to 1,152.86, 1,728.86 and 412.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.86 : 1,728.86 = 412.27 : x
2. Step 2: Convert to fraction form
   1,152.86/1,728.86 = 412.27/x
3. Step 3: Cross multiply
   1,152.86x = 1,728.86 × 412.27
4. Step 4: Simplify right side
   1,152.86x = 712,758.66
5. Step 5: Solve for x
   x = 712,758.66/1,152.86
6. Step 6: Final answer
   x = 618.25