Finding the Fourth Proportional to 1,152.15, 1,726.20 and 945.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.15 : 1,726.20 = 945.60 : x
2. Step 2: Convert to fraction form
   1,152.15/1,726.20 = 945.60/x
3. Step 3: Cross multiply
   1,152.15x = 1,726.20 × 945.60
4. Step 4: Simplify right side
   1,152.15x = 1,632,294.72
5. Step 5: Solve for x
   x = 1,632,294.72/1,152.15
6. Step 6: Final answer
   x = 1,416.74