Finding the Fourth Proportional to 2,123.15, 2,930.00 and 1,239.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.15 : 2,930.00 = 1,239.57 : x
2. Step 2: Convert to fraction form
   2,123.15/2,930.00 = 1,239.57/x
3. Step 3: Cross multiply
   2,123.15x = 2,930.00 × 1,239.57
4. Step 4: Simplify right side
   2,123.15x = 3,631,933.90
5. Step 5: Solve for x
   x = 3,631,933.90/2,123.15
6. Step 6: Final answer
   x = 1,710.64