Finding the Fourth Proportional to 1,379.52, 2,057.31 and 1,306.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.52 : 2,057.31 = 1,306.62 : x
2. Step 2: Convert to fraction form
   1,379.52/2,057.31 = 1,306.62/x
3. Step 3: Cross multiply
   1,379.52x = 2,057.31 × 1,306.62
4. Step 4: Simplify right side
   1,379.52x = 2,688,122.39
5. Step 5: Solve for x
   x = 2,688,122.39/1,379.52
6. Step 6: Final answer
   x = 1,948.59