Finding the Fourth Proportional to 1,018.51, 1,405.55 and 552.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.51 : 1,405.55 = 552.76 : x
2. Step 2: Convert to fraction form
   1,018.51/1,405.55 = 552.76/x
3. Step 3: Cross multiply
   1,018.51x = 1,405.55 × 552.76
4. Step 4: Simplify right side
   1,018.51x = 776,929.05
5. Step 5: Solve for x
   x = 776,929.05/1,018.51
6. Step 6: Final answer
   x = 762.81