Finding the Fourth Proportional to 11,912.56, 17,868.96 and 3,148.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,912.56 : 17,868.96 = 3,148.72 : x
2. Step 2: Convert to fraction form
   11,912.56/17,868.96 = 3,148.72/x
3. Step 3: Cross multiply
   11,912.56x = 17,868.96 × 3,148.72
4. Step 4: Simplify right side
   11,912.56x = 56,264,351.73
5. Step 5: Solve for x
   x = 56,264,351.73/11,912.56
6. Step 6: Final answer
   x = 4,723.11