Finding the Fourth Proportional to 12,491.72, 18,722.94 and 5,091.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,491.72 : 18,722.94 = 5,091.56 : x
2. Step 2: Convert to fraction form
   12,491.72/18,722.94 = 5,091.56/x
3. Step 3: Cross multiply
   12,491.72x = 18,722.94 × 5,091.56
4. Step 4: Simplify right side
   12,491.72x = 95,328,972.39
5. Step 5: Solve for x
   x = 95,328,972.39/12,491.72
6. Step 6: Final answer
   x = 7,631.37