Finding the Fourth Proportional to 5,216.28, 7,824.15 and 1,320.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,216.28 : 7,824.15 = 1,320.72 : x
2. Step 2: Convert to fraction form
   5,216.28/7,824.15 = 1,320.72/x
3. Step 3: Cross multiply
   5,216.28x = 7,824.15 × 1,320.72
4. Step 4: Simplify right side
   5,216.28x = 10,333,511.39
5. Step 5: Solve for x
   x = 10,333,511.39/5,216.28
6. Step 6: Final answer
   x = 1,981.01