Finding the Fourth Proportional to 12,974.72, 19,442.16 and 8,742.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,974.72 : 19,442.16 = 8,742.20 : x
2. Step 2: Convert to fraction form
   12,974.72/19,442.16 = 8,742.20/x
3. Step 3: Cross multiply
   12,974.72x = 19,442.16 × 8,742.20
4. Step 4: Simplify right side
   12,974.72x = 169,967,251.15
5. Step 5: Solve for x
   x = 169,967,251.15/12,974.72
6. Step 6: Final answer
   x = 13,099.88