Finding the Fourth Proportional to 3,581.42, 5,374.55 and 1,389.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,581.42 : 5,374.55 = 1,389.86 : x
2. Step 2: Convert to fraction form
   3,581.42/5,374.55 = 1,389.86/x
3. Step 3: Cross multiply
   3,581.42x = 5,374.55 × 1,389.86
4. Step 4: Simplify right side
   3,581.42x = 7,469,868.82
5. Step 5: Solve for x
   x = 7,469,868.82/3,581.42
6. Step 6: Final answer
   x = 2,085.73