Finding the Fourth Proportional to 9,279.09, 12,806.06 and 5,300.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,279.09 : 12,806.06 = 5,300.78 : x
2. Step 2: Convert to fraction form
   9,279.09/12,806.06 = 5,300.78/x
3. Step 3: Cross multiply
   9,279.09x = 12,806.06 × 5,300.78
4. Step 4: Simplify right side
   9,279.09x = 67,882,016.19
5. Step 5: Solve for x
   x = 67,882,016.19/9,279.09
6. Step 6: Final answer
   x = 7,315.59