Finding the Fourth Proportional to 1,012.79, 1,518.72 and 574.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.79 : 1,518.72 = 574.04 : x
2. Step 2: Convert to fraction form
   1,012.79/1,518.72 = 574.04/x
3. Step 3: Cross multiply
   1,012.79x = 1,518.72 × 574.04
4. Step 4: Simplify right side
   1,012.79x = 871,807.67
5. Step 5: Solve for x
   x = 871,807.67/1,012.79
6. Step 6: Final answer
   x = 860.80