Finding the Fourth Proportional to 2,357.92, 3,538.37 and 1,318.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,357.92 : 3,538.37 = 1,318.61 : x
2. Step 2: Convert to fraction form
   2,357.92/3,538.37 = 1,318.61/x
3. Step 3: Cross multiply
   2,357.92x = 3,538.37 × 1,318.61
4. Step 4: Simplify right side
   2,357.92x = 4,665,715.67
5. Step 5: Solve for x
   x = 4,665,715.67/2,357.92
6. Step 6: Final answer
   x = 1,978.74