Finding the Fourth Proportional to 10,969.30, 15,128.08 and 7,776.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,969.30 : 15,128.08 = 7,776.28 : x
2. Step 2: Convert to fraction form
   10,969.30/15,128.08 = 7,776.28/x
3. Step 3: Cross multiply
   10,969.30x = 15,128.08 × 7,776.28
4. Step 4: Simplify right side
   10,969.30x = 117,640,185.94
5. Step 5: Solve for x
   x = 117,640,185.94/10,969.30
6. Step 6: Final answer
   x = 10,724.49