Finding the Fourth Proportional to 1,310.37, 1,964.18 and 579.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,310.37 : 1,964.18 = 579.86 : x
2. Step 2: Convert to fraction form
   1,310.37/1,964.18 = 579.86/x
3. Step 3: Cross multiply
   1,310.37x = 1,964.18 × 579.86
4. Step 4: Simplify right side
   1,310.37x = 1,138,936.69
5. Step 5: Solve for x
   x = 1,138,936.69/1,310.37
6. Step 6: Final answer
   x = 869.17