Finding the Fourth Proportional to 1,890.81, 2,609.42 and 1,424.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.81 : 2,609.42 = 1,424.25 : x
2. Step 2: Convert to fraction form
   1,890.81/2,609.42 = 1,424.25/x
3. Step 3: Cross multiply
   1,890.81x = 2,609.42 × 1,424.25
4. Step 4: Simplify right side
   1,890.81x = 3,716,459.31
5. Step 5: Solve for x
   x = 3,716,459.31/1,890.81
6. Step 6: Final answer
   x = 1,965.54