Finding the Fourth Proportional to 1,018.68, 1,405.59 and 570.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.68 : 1,405.59 = 570.54 : x
2. Step 2: Convert to fraction form
   1,018.68/1,405.59 = 570.54/x
3. Step 3: Cross multiply
   1,018.68x = 1,405.59 × 570.54
4. Step 4: Simplify right side
   1,018.68x = 801,948.45
5. Step 5: Solve for x
   x = 801,948.45/1,018.68
6. Step 6: Final answer
   x = 787.25