Finding the Fourth Proportional to 10,920.24, 15,090.35 and 9,304.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,920.24 : 15,090.35 = 9,304.25 : x
2. Step 2: Convert to fraction form
   10,920.24/15,090.35 = 9,304.25/x
3. Step 3: Cross multiply
   10,920.24x = 15,090.35 × 9,304.25
4. Step 4: Simplify right side
   10,920.24x = 140,404,267.01
5. Step 5: Solve for x
   x = 140,404,267.01/10,920.24
6. Step 6: Final answer
   x = 12,857.25