Finding the Fourth Proportional to 1,018.24, 1,405.15 and 552.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.24 : 1,405.15 = 552.49 : x
2. Step 2: Convert to fraction form
   1,018.24/1,405.15 = 552.49/x
3. Step 3: Cross multiply
   1,018.24x = 1,405.15 × 552.49
4. Step 4: Simplify right side
   1,018.24x = 776,326.43
5. Step 5: Solve for x
   x = 776,326.43/1,018.24
6. Step 6: Final answer
   x = 762.42