Finding the Fourth Proportional to 12,320.40, 18,483.60 and 3,555.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,320.40 : 18,483.60 = 3,555.12 : x
2. Step 2: Convert to fraction form
   12,320.40/18,483.60 = 3,555.12/x
3. Step 3: Cross multiply
   12,320.40x = 18,483.60 × 3,555.12
4. Step 4: Simplify right side
   12,320.40x = 65,711,416.03
5. Step 5: Solve for x
   x = 65,711,416.03/12,320.40
6. Step 6: Final answer
   x = 5,333.55