Finding the Fourth Proportional to 2,128.74, 2,938.86 and 1,383.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.74 : 2,938.86 = 1,383.36 : x
2. Step 2: Convert to fraction form
   2,128.74/2,938.86 = 1,383.36/x
3. Step 3: Cross multiply
   2,128.74x = 2,938.86 × 1,383.36
4. Step 4: Simplify right side
   2,128.74x = 4,065,501.37
5. Step 5: Solve for x
   x = 4,065,501.37/2,128.74
6. Step 6: Final answer
   x = 1,909.82