Finding the Fourth Proportional to 2,390.31, 3,584.86 and 928.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.31 : 3,584.86 = 928.67 : x
2. Step 2: Convert to fraction form
   2,390.31/3,584.86 = 928.67/x
3. Step 3: Cross multiply
   2,390.31x = 3,584.86 × 928.67
4. Step 4: Simplify right side
   2,390.31x = 3,329,131.69
5. Step 5: Solve for x
   x = 3,329,131.69/2,390.31
6. Step 6: Final answer
   x = 1,392.76