Finding the Fourth Proportional to 13,280.76, 19,923.84 and 5,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,280.76 : 19,923.84 = 5,490.72 : x
2. Step 2: Convert to fraction form
   13,280.76/19,923.84 = 5,490.72/x
3. Step 3: Cross multiply
   13,280.76x = 19,923.84 × 5,490.72
4. Step 4: Simplify right side
   13,280.76x = 109,396,226.76
5. Step 5: Solve for x
   x = 109,396,226.76/13,280.76
6. Step 6: Final answer
   x = 8,237.20