Finding the Fourth Proportional to 12,111.48, 18,165.94 and 4,212.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.48 : 18,165.94 = 4,212.60 : x
2. Step 2: Convert to fraction form
   12,111.48/18,165.94 = 4,212.60/x
3. Step 3: Cross multiply
   12,111.48x = 18,165.94 × 4,212.60
4. Step 4: Simplify right side
   12,111.48x = 76,525,838.84
5. Step 5: Solve for x
   x = 76,525,838.84/12,111.48
6. Step 6: Final answer
   x = 6,318.45