Finding the Fourth Proportional to 11,447.39, 15,788.72 and 9,856.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,447.39 : 15,788.72 = 9,856.76 : x
2. Step 2: Convert to fraction form
   11,447.39/15,788.72 = 9,856.76/x
3. Step 3: Cross multiply
   11,447.39x = 15,788.72 × 9,856.76
4. Step 4: Simplify right side
   11,447.39x = 155,625,569.45
5. Step 5: Solve for x
   x = 155,625,569.45/11,447.39
6. Step 6: Final answer
   x = 13,594.85