Finding the Fourth Proportional to 1,424.72, 2,138.04 and 1,326.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.72 : 2,138.04 = 1,326.80 : x
2. Step 2: Convert to fraction form
   1,424.72/2,138.04 = 1,326.80/x
3. Step 3: Cross multiply
   1,424.72x = 2,138.04 × 1,326.80
4. Step 4: Simplify right side
   1,424.72x = 2,836,751.47
5. Step 5: Solve for x
   x = 2,836,751.47/1,424.72
6. Step 6: Final answer
   x = 1,991.09