Finding the Fourth Proportional to 12,131.72, 16,742.94 and 7,420.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,131.72 : 16,742.94 = 7,420.76 : x
2. Step 2: Convert to fraction form
   12,131.72/16,742.94 = 7,420.76/x
3. Step 3: Cross multiply
   12,131.72x = 16,742.94 × 7,420.76
4. Step 4: Simplify right side
   12,131.72x = 124,245,339.43
5. Step 5: Solve for x
   x = 124,245,339.43/12,131.72
6. Step 6: Final answer
   x = 10,241.36