Finding the Fourth Proportional to 2,612.55, 3,605.31 and 1,433.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.55 : 3,605.31 = 1,433.61 : x
2. Step 2: Convert to fraction form
   2,612.55/3,605.31 = 1,433.61/x
3. Step 3: Cross multiply
   2,612.55x = 3,605.31 × 1,433.61
4. Step 4: Simplify right side
   2,612.55x = 5,168,608.47
5. Step 5: Solve for x
   x = 5,168,608.47/2,612.55
6. Step 6: Final answer
   x = 1,978.38