Finding the Fourth Proportional to 1,147.15, 1,579.47 and 1,012.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.15 : 1,579.47 = 1,012.42 : x
2. Step 2: Convert to fraction form
   1,147.15/1,579.47 = 1,012.42/x
3. Step 3: Cross multiply
   1,147.15x = 1,579.47 × 1,012.42
4. Step 4: Simplify right side
   1,147.15x = 1,599,087.02
5. Step 5: Solve for x
   x = 1,599,087.02/1,147.15
6. Step 6: Final answer
   x = 1,393.97