Finding the Fourth Proportional to 9,208.56, 12,709.47 and 5,431.51

Step by Step Solution

1. Step 1: Write the proportion equation
   9,208.56 : 12,709.47 = 5,431.51 : x
2. Step 2: Convert to fraction form
   9,208.56/12,709.47 = 5,431.51/x
3. Step 3: Cross multiply
   9,208.56x = 12,709.47 × 5,431.51
4. Step 4: Simplify right side
   9,208.56x = 69,031,555.25
5. Step 5: Solve for x
   x = 69,031,555.25/9,208.56
6. Step 6: Final answer
   x = 7,496.45