Finding the Fourth Proportional to 2,920.28, 4,380.72 and 971.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.28 : 4,380.72 = 971.96 : x
2. Step 2: Convert to fraction form
   2,920.28/4,380.72 = 971.96/x
3. Step 3: Cross multiply
   2,920.28x = 4,380.72 × 971.96
4. Step 4: Simplify right side
   2,920.28x = 4,257,884.61
5. Step 5: Solve for x
   x = 4,257,884.61/2,920.28
6. Step 6: Final answer
   x = 1,458.04