Finding the Fourth Proportional to 1,520.79, 2,285.45 and 904.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.79 : 2,285.45 = 904.59 : x
2. Step 2: Convert to fraction form
   1,520.79/2,285.45 = 904.59/x
3. Step 3: Cross multiply
   1,520.79x = 2,285.45 × 904.59
4. Step 4: Simplify right side
   1,520.79x = 2,067,390.69
5. Step 5: Solve for x
   x = 2,067,390.69/1,520.79
6. Step 6: Final answer
   x = 1,359.42