Finding the Fourth Proportional to 3,890.71, 5,837.42 and 1,425.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,890.71 : 5,837.42 = 1,425.78 : x
2. Step 2: Convert to fraction form
   3,890.71/5,837.42 = 1,425.78/x
3. Step 3: Cross multiply
   3,890.71x = 5,837.42 × 1,425.78
4. Step 4: Simplify right side
   3,890.71x = 8,322,876.69
5. Step 5: Solve for x
   x = 8,322,876.69/3,890.71
6. Step 6: Final answer
   x = 2,139.17