Finding the Fourth Proportional to 12,081.60, 18,111.60 and 4,683.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,081.60 : 18,111.60 = 4,683.60 : x
2. Step 2: Convert to fraction form
   12,081.60/18,111.60 = 4,683.60/x
3. Step 3: Cross multiply
   12,081.60x = 18,111.60 × 4,683.60
4. Step 4: Simplify right side
   12,081.60x = 84,827,489.76
5. Step 5: Solve for x
   x = 84,827,489.76/12,081.60
6. Step 6: Final answer
   x = 7,021.21