Finding the Fourth Proportional to 2,612.80, 3,605.63 and 1,433.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.80 : 3,605.63 = 1,433.87 : x
2. Step 2: Convert to fraction form
   2,612.80/3,605.63 = 1,433.87/x
3. Step 3: Cross multiply
   2,612.80x = 3,605.63 × 1,433.87
4. Step 4: Simplify right side
   2,612.80x = 5,170,004.69
5. Step 5: Solve for x
   x = 5,170,004.69/2,612.80
6. Step 6: Final answer
   x = 1,978.72