Finding the Fourth Proportional to 9,581.60, 13,215.48 and 8,460.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,581.60 : 13,215.48 = 8,460.56 : x
2. Step 2: Convert to fraction form
   9,581.60/13,215.48 = 8,460.56/x
3. Step 3: Cross multiply
   9,581.60x = 13,215.48 × 8,460.56
4. Step 4: Simplify right side
   9,581.60x = 111,810,361.47
5. Step 5: Solve for x
   x = 111,810,361.47/9,581.60
6. Step 6: Final answer
   x = 11,669.28