Finding the Fourth Proportional to 1,018.35, 1,405.32 and 552.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.35 : 1,405.32 = 552.60 : x
2. Step 2: Convert to fraction form
   1,018.35/1,405.32 = 552.60/x
3. Step 3: Cross multiply
   1,018.35x = 1,405.32 × 552.60
4. Step 4: Simplify right side
   1,018.35x = 776,579.83
5. Step 5: Solve for x
   x = 776,579.83/1,018.35
6. Step 6: Final answer
   x = 762.59