Finding the Fourth Proportional to 1,443.42, 2,164.89 and 518.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.42 : 2,164.89 = 518.79 : x
2. Step 2: Convert to fraction form
   1,443.42/2,164.89 = 518.79/x
3. Step 3: Cross multiply
   1,443.42x = 2,164.89 × 518.79
4. Step 4: Simplify right side
   1,443.42x = 1,123,123.28
5. Step 5: Solve for x
   x = 1,123,123.28/1,443.42
6. Step 6: Final answer
   x = 778.10