Finding the Fourth Proportional to 1,426.83, 2,128.78 and 1,270.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.83 : 2,128.78 = 1,270.90 : x
2. Step 2: Convert to fraction form
   1,426.83/2,128.78 = 1,270.90/x
3. Step 3: Cross multiply
   1,426.83x = 2,128.78 × 1,270.90
4. Step 4: Simplify right side
   1,426.83x = 2,705,466.50
5. Step 5: Solve for x
   x = 2,705,466.50/1,426.83
6. Step 6: Final answer
   x = 1,896.14