Finding the Fourth Proportional to 12,155.57, 18,233.34 and 3,947.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.57 : 18,233.34 = 3,947.57 : x
2. Step 2: Convert to fraction form
   12,155.57/18,233.34 = 3,947.57/x
3. Step 3: Cross multiply
   12,155.57x = 18,233.34 × 3,947.57
4. Step 4: Simplify right side
   12,155.57x = 71,977,385.98
5. Step 5: Solve for x
   x = 71,977,385.98/12,155.57
6. Step 6: Final answer
   x = 5,921.35