Finding the Fourth Proportional to 1,012.56, 1,518.70 and 395.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.56 : 1,518.70 = 395.83 : x
2. Step 2: Convert to fraction form
   1,012.56/1,518.70 = 395.83/x
3. Step 3: Cross multiply
   1,012.56x = 1,518.70 × 395.83
4. Step 4: Simplify right side
   1,012.56x = 601,147.02
5. Step 5: Solve for x
   x = 601,147.02/1,012.56
6. Step 6: Final answer
   x = 593.69