Finding the Fourth Proportional to 10,660.14, 14,734.35 and 9,391.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,660.14 : 14,734.35 = 9,391.50 : x
2. Step 2: Convert to fraction form
   10,660.14/14,734.35 = 9,391.50/x
3. Step 3: Cross multiply
   10,660.14x = 14,734.35 × 9,391.50
4. Step 4: Simplify right side
   10,660.14x = 138,377,648.03
5. Step 5: Solve for x
   x = 138,377,648.03/10,660.14
6. Step 6: Final answer
   x = 12,980.85