Finding the Fourth Proportional to 12,078.06, 18,113.43 and 7,146.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.06 : 18,113.43 = 7,146.39 : x
2. Step 2: Convert to fraction form
   12,078.06/18,113.43 = 7,146.39/x
3. Step 3: Cross multiply
   12,078.06x = 18,113.43 × 7,146.39
4. Step 4: Simplify right side
   12,078.06x = 129,445,635.02
5. Step 5: Solve for x
   x = 129,445,635.02/12,078.06
6. Step 6: Final answer
   x = 10,717.42