Finding the Fourth Proportional to 9,315.30, 13,979.76 and 5,158.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.30 : 13,979.76 = 5,158.80 : x
2. Step 2: Convert to fraction form
   9,315.30/13,979.76 = 5,158.80/x
3. Step 3: Cross multiply
   9,315.30x = 13,979.76 × 5,158.80
4. Step 4: Simplify right side
   9,315.30x = 72,118,785.89
5. Step 5: Solve for x
   x = 72,118,785.89/9,315.30
6. Step 6: Final answer
   x = 7,741.97