Finding the Fourth Proportional to 928.72, 1,390.34 and 683.59

Step by Step Solution

1. Step 1: Write the proportion equation
   928.72 : 1,390.34 = 683.59 : x
2. Step 2: Convert to fraction form
   928.72/1,390.34 = 683.59/x
3. Step 3: Cross multiply
   928.72x = 1,390.34 × 683.59
4. Step 4: Simplify right side
   928.72x = 950,422.52
5. Step 5: Solve for x
   x = 950,422.52/928.72
6. Step 6: Final answer
   x = 1,023.37