Finding the Fourth Proportional to 1,018.57, 1,405.61 and 552.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.57 : 1,405.61 = 552.82 : x
2. Step 2: Convert to fraction form
   1,018.57/1,405.61 = 552.82/x
3. Step 3: Cross multiply
   1,018.57x = 1,405.61 × 552.82
4. Step 4: Simplify right side
   1,018.57x = 777,046.56
5. Step 5: Solve for x
   x = 777,046.56/1,018.57
6. Step 6: Final answer
   x = 762.88