Finding the Fourth Proportional to 5,148.56, 7,719.20 and 3,667.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,148.56 : 7,719.20 = 3,667.78 : x
2. Step 2: Convert to fraction form
   5,148.56/7,719.20 = 3,667.78/x
3. Step 3: Cross multiply
   5,148.56x = 7,719.20 × 3,667.78
4. Step 4: Simplify right side
   5,148.56x = 28,312,332.44
5. Step 5: Solve for x
   x = 28,312,332.44/5,148.56
6. Step 6: Final answer
   x = 5,499.08