Finding the Fourth Proportional to 9,258.60, 12,776.81 and 8,505.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,258.60 : 12,776.81 = 8,505.50 : x
2. Step 2: Convert to fraction form
   9,258.60/12,776.81 = 8,505.50/x
3. Step 3: Cross multiply
   9,258.60x = 12,776.81 × 8,505.50
4. Step 4: Simplify right side
   9,258.60x = 108,673,157.46
5. Step 5: Solve for x
   x = 108,673,157.46/9,258.60
6. Step 6: Final answer
   x = 11,737.54