Finding the Fourth Proportional to 2,123.33, 2,930.63 and 1,239.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.33 : 2,930.63 = 1,239.21 : x
2. Step 2: Convert to fraction form
   2,123.33/2,930.63 = 1,239.21/x
3. Step 3: Cross multiply
   2,123.33x = 2,930.63 × 1,239.21
4. Step 4: Simplify right side
   2,123.33x = 3,631,659.81
5. Step 5: Solve for x
   x = 3,631,659.81/2,123.33
6. Step 6: Final answer
   x = 1,710.36