Finding the Fourth Proportional to 11,647.72, 17,471.72 and 3,856.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,647.72 : 17,471.72 = 3,856.60 : x
2. Step 2: Convert to fraction form
   11,647.72/17,471.72 = 3,856.60/x
3. Step 3: Cross multiply
   11,647.72x = 17,471.72 × 3,856.60
4. Step 4: Simplify right side
   11,647.72x = 67,381,435.35
5. Step 5: Solve for x
   x = 67,381,435.35/11,647.72
6. Step 6: Final answer
   x = 5,784.95