Finding the Fourth Proportional to 1,018.22, 1,405.17 and 552.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.22 : 1,405.17 = 552.50 : x
2. Step 2: Convert to fraction form
   1,018.22/1,405.17 = 552.50/x
3. Step 3: Cross multiply
   1,018.22x = 1,405.17 × 552.50
4. Step 4: Simplify right side
   1,018.22x = 776,356.43
5. Step 5: Solve for x
   x = 776,356.43/1,018.22
6. Step 6: Final answer
   x = 762.46