Finding the Fourth Proportional to 12,427.72, 17,146.56 and 7,389.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,427.72 : 17,146.56 = 7,389.40 : x
2. Step 2: Convert to fraction form
   12,427.72/17,146.56 = 7,389.40/x
3. Step 3: Cross multiply
   12,427.72x = 17,146.56 × 7,389.40
4. Step 4: Simplify right side
   12,427.72x = 126,702,790.46
5. Step 5: Solve for x
   x = 126,702,790.46/12,427.72
6. Step 6: Final answer
   x = 10,195.18