Finding the Fourth Proportional to 2,126.81, 3,182.36 and 1,290.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,126.81 : 3,182.36 = 1,290.89 : x
2. Step 2: Convert to fraction form
   2,126.81/3,182.36 = 1,290.89/x
3. Step 3: Cross multiply
   2,126.81x = 3,182.36 × 1,290.89
4. Step 4: Simplify right side
   2,126.81x = 4,108,054.33
5. Step 5: Solve for x
   x = 4,108,054.33/2,126.81
6. Step 6: Final answer
   x = 1,931.56