Finding the Fourth Proportional to 2,123.18, 2,930.17 and 1,239.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.18 : 2,930.17 = 1,239.27 : x
2. Step 2: Convert to fraction form
   2,123.18/2,930.17 = 1,239.27/x
3. Step 3: Cross multiply
   2,123.18x = 2,930.17 × 1,239.27
4. Step 4: Simplify right side
   2,123.18x = 3,631,262.34
5. Step 5: Solve for x
   x = 3,631,262.34/2,123.18
6. Step 6: Final answer
   x = 1,710.30