Finding the Fourth Proportional to 1,317.83, 1,976.27 and 440.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.83 : 1,976.27 = 440.15 : x
2. Step 2: Convert to fraction form
   1,317.83/1,976.27 = 440.15/x
3. Step 3: Cross multiply
   1,317.83x = 1,976.27 × 440.15
4. Step 4: Simplify right side
   1,317.83x = 869,843.16
5. Step 5: Solve for x
   x = 869,843.16/1,317.83
6. Step 6: Final answer
   x = 660.06