Finding the Fourth Proportional to 1,012.47, 1,517.54 and 395.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.47 : 1,517.54 = 395.56 : x
2. Step 2: Convert to fraction form
   1,012.47/1,517.54 = 395.56/x
3. Step 3: Cross multiply
   1,012.47x = 1,517.54 × 395.56
4. Step 4: Simplify right side
   1,012.47x = 600,273.77
5. Step 5: Solve for x
   x = 600,273.77/1,012.47
6. Step 6: Final answer
   x = 592.88