Finding the Fourth Proportional to 5,280.51, 7,919.55 and 3,647.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280.51 : 7,919.55 = 3,647.55 : x
2. Step 2: Convert to fraction form
   5,280.51/7,919.55 = 3,647.55/x
3. Step 3: Cross multiply
   5,280.51x = 7,919.55 × 3,647.55
4. Step 4: Simplify right side
   5,280.51x = 28,886,954.60
5. Step 5: Solve for x
   x = 28,886,954.60/5,280.51
6. Step 6: Final answer
   x = 5,470.49