Finding the Fourth Proportional to 12,078.63, 18,118.76 and 3,312.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.63 : 18,118.76 = 3,312.81 : x
2. Step 2: Convert to fraction form
   12,078.63/18,118.76 = 3,312.81/x
3. Step 3: Cross multiply
   12,078.63x = 18,118.76 × 3,312.81
4. Step 4: Simplify right side
   12,078.63x = 60,023,992.75
5. Step 5: Solve for x
   x = 60,023,992.75/12,078.63
6. Step 6: Final answer
   x = 4,969.44