Finding the Fourth Proportional to 3,890.89, 5,838.61 and 1,425.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,890.89 : 5,838.61 = 1,425.88 : x
2. Step 2: Convert to fraction form
   3,890.89/5,838.61 = 1,425.88/x
3. Step 3: Cross multiply
   3,890.89x = 5,838.61 × 1,425.88
4. Step 4: Simplify right side
   3,890.89x = 8,325,143.20
5. Step 5: Solve for x
   x = 8,325,143.20/3,890.89
6. Step 6: Final answer
   x = 2,139.65