Finding the Fourth Proportional to 2,123.35, 2,930.45 and 1,239.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.35 : 2,930.45 = 1,239.44 : x
2. Step 2: Convert to fraction form
   2,123.35/2,930.45 = 1,239.44/x
3. Step 3: Cross multiply
   2,123.35x = 2,930.45 × 1,239.44
4. Step 4: Simplify right side
   2,123.35x = 3,632,096.10
5. Step 5: Solve for x
   x = 3,632,096.10/2,123.35
6. Step 6: Final answer
   x = 1,710.55