Finding the Fourth Proportional to 10,853.28, 14,968.80 and 7,315.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,853.28 : 14,968.80 = 7,315.20 : x
2. Step 2: Convert to fraction form
   10,853.28/14,968.80 = 7,315.20/x
3. Step 3: Cross multiply
   10,853.28x = 14,968.80 × 7,315.20
4. Step 4: Simplify right side
   10,853.28x = 109,499,765.76
5. Step 5: Solve for x
   x = 109,499,765.76/10,853.28
6. Step 6: Final answer
   x = 10,089.09