Finding the Fourth Proportional to 1,605.20, 2,404.56 and 1,313.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.20 : 2,404.56 = 1,313.60 : x
2. Step 2: Convert to fraction form
   1,605.20/2,404.56 = 1,313.60/x
3. Step 3: Cross multiply
   1,605.20x = 2,404.56 × 1,313.60
4. Step 4: Simplify right side
   1,605.20x = 3,158,630.02
5. Step 5: Solve for x
   x = 3,158,630.02/1,605.20
6. Step 6: Final answer
   x = 1,967.75