Finding the Fourth Proportional to 1,018.06, 1,404.91 and 552.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.06 : 1,404.91 = 552.31 : x
2. Step 2: Convert to fraction form
   1,018.06/1,404.91 = 552.31/x
3. Step 3: Cross multiply
   1,018.06x = 1,404.91 × 552.31
4. Step 4: Simplify right side
   1,018.06x = 775,943.02
5. Step 5: Solve for x
   x = 775,943.02/1,018.06
6. Step 6: Final answer
   x = 762.18