Finding the Fourth Proportional to 12,820.56, 17,692.32 and 7,231.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.56 : 17,692.32 = 7,231.52 : x
2. Step 2: Convert to fraction form
   12,820.56/17,692.32 = 7,231.52/x
3. Step 3: Cross multiply
   12,820.56x = 17,692.32 × 7,231.52
4. Step 4: Simplify right side
   12,820.56x = 127,942,365.93
5. Step 5: Solve for x
   x = 127,942,365.93/12,820.56
6. Step 6: Final answer
   x = 9,979.47