Finding the Fourth Proportional to 8,145.78, 12,216.60 and 3,463.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,145.78 : 12,216.60 = 3,463.20 : x
2. Step 2: Convert to fraction form
   8,145.78/12,216.60 = 3,463.20/x
3. Step 3: Cross multiply
   8,145.78x = 12,216.60 × 3,463.20
4. Step 4: Simplify right side
   8,145.78x = 42,308,529.12
5. Step 5: Solve for x
   x = 42,308,529.12/8,145.78
6. Step 6: Final answer
   x = 5,193.92