Finding the Fourth Proportional to 2,021.50, 2,789.70 and 1,235.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,021.50 : 2,789.70 = 1,235.38 : x
2. Step 2: Convert to fraction form
   2,021.50/2,789.70 = 1,235.38/x
3. Step 3: Cross multiply
   2,021.50x = 2,789.70 × 1,235.38
4. Step 4: Simplify right side
   2,021.50x = 3,446,339.59
5. Step 5: Solve for x
   x = 3,446,339.59/2,021.50
6. Step 6: Final answer
   x = 1,704.84