Finding the Fourth Proportional to 2,123.68, 2,930.52 and 1,239.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.68 : 2,930.52 = 1,239.52 : x
2. Step 2: Convert to fraction form
   2,123.68/2,930.52 = 1,239.52/x
3. Step 3: Cross multiply
   2,123.68x = 2,930.52 × 1,239.52
4. Step 4: Simplify right side
   2,123.68x = 3,632,438.15
5. Step 5: Solve for x
   x = 3,632,438.15/2,123.68
6. Step 6: Final answer
   x = 1,710.45