Finding the Fourth Proportional to 8,525.28, 12,772.56 and 7,137.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,525.28 : 12,772.56 = 7,137.12 : x
2. Step 2: Convert to fraction form
   8,525.28/12,772.56 = 7,137.12/x
3. Step 3: Cross multiply
   8,525.28x = 12,772.56 × 7,137.12
4. Step 4: Simplify right side
   8,525.28x = 91,159,293.43
5. Step 5: Solve for x
   x = 91,159,293.43/8,525.28
6. Step 6: Final answer
   x = 10,692.82