Finding the Fourth Proportional to 11,912.34, 17,868.18 and 3,147.33

Step by Step Solution

1. Step 1: Write the proportion equation
   11,912.34 : 17,868.18 = 3,147.33 : x
2. Step 2: Convert to fraction form
   11,912.34/17,868.18 = 3,147.33/x
3. Step 3: Cross multiply
   11,912.34x = 17,868.18 × 3,147.33
4. Step 4: Simplify right side
   11,912.34x = 56,237,058.96
5. Step 5: Solve for x
   x = 56,237,058.96/11,912.34
6. Step 6: Final answer
   x = 4,720.91