Finding the Fourth Proportional to 5,280.50, 7,920.72 and 1,384.88

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280.50 : 7,920.72 = 1,384.88 : x
2. Step 2: Convert to fraction form
   5,280.50/7,920.72 = 1,384.88/x
3. Step 3: Cross multiply
   5,280.50x = 7,920.72 × 1,384.88
4. Step 4: Simplify right side
   5,280.50x = 10,969,207.11
5. Step 5: Solve for x
   x = 10,969,207.11/5,280.50
6. Step 6: Final answer
   x = 2,077.30