Finding the Fourth Proportional to 1,443.40, 2,164.53 and 518.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.40 : 2,164.53 = 518.98 : x
2. Step 2: Convert to fraction form
   1,443.40/2,164.53 = 518.98/x
3. Step 3: Cross multiply
   1,443.40x = 2,164.53 × 518.98
4. Step 4: Simplify right side
   1,443.40x = 1,123,347.78
5. Step 5: Solve for x
   x = 1,123,347.78/1,443.40
6. Step 6: Final answer
   x = 778.27