Finding the Fourth Proportional to 1,008.24, 1,510.56 and 618.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.24 : 1,510.56 = 618.05 : x
2. Step 2: Convert to fraction form
   1,008.24/1,510.56 = 618.05/x
3. Step 3: Cross multiply
   1,008.24x = 1,510.56 × 618.05
4. Step 4: Simplify right side
   1,008.24x = 933,594.06
5. Step 5: Solve for x
   x = 933,594.06/1,008.24
6. Step 6: Final answer
   x = 925.96