Finding the Fourth Proportional to 9,391.64, 12,960.48 and 5,084.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.64 : 12,960.48 = 5,084.78 : x
2. Step 2: Convert to fraction form
   9,391.64/12,960.48 = 5,084.78/x
3. Step 3: Cross multiply
   9,391.64x = 12,960.48 × 5,084.78
4. Step 4: Simplify right side
   9,391.64x = 65,901,143.76
5. Step 5: Solve for x
   x = 65,901,143.76/9,391.64
6. Step 6: Final answer
   x = 7,017.00