Finding the Fourth Proportional to 1,012.72, 1,507.56 and 1,007.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.72 : 1,507.56 = 1,007.24 : x
2. Step 2: Convert to fraction form
   1,012.72/1,507.56 = 1,007.24/x
3. Step 3: Cross multiply
   1,012.72x = 1,507.56 × 1,007.24
4. Step 4: Simplify right side
   1,012.72x = 1,518,474.73
5. Step 5: Solve for x
   x = 1,518,474.73/1,012.72
6. Step 6: Final answer
   x = 1,499.40