Finding the Fourth Proportional to 8,190.32, 12,280.56 and 3,260.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,190.32 : 12,280.56 = 3,260.72 : x
2. Step 2: Convert to fraction form
   8,190.32/12,280.56 = 3,260.72/x
3. Step 3: Cross multiply
   8,190.32x = 12,280.56 × 3,260.72
4. Step 4: Simplify right side
   8,190.32x = 40,043,467.60
5. Step 5: Solve for x
   x = 40,043,467.60/8,190.32
6. Step 6: Final answer
   x = 4,889.12