Finding the Fourth Proportional to 1,018.15, 1,405.03 and 570.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.15 : 1,405.03 = 570.00 : x
2. Step 2: Convert to fraction form
   1,018.15/1,405.03 = 570.00/x
3. Step 3: Cross multiply
   1,018.15x = 1,405.03 × 570.00
4. Step 4: Simplify right side
   1,018.15x = 800,857.22
5. Step 5: Solve for x
   x = 800,857.22/1,018.15
6. Step 6: Final answer
   x = 786.58