Finding the Fourth Proportional to 9,005.31, 12,427.83 and 5,228.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,005.31 : 12,427.83 = 5,228.55 : x
2. Step 2: Convert to fraction form
   9,005.31/12,427.83 = 5,228.55/x
3. Step 3: Cross multiply
   9,005.31x = 12,427.83 × 5,228.55
4. Step 4: Simplify right side
   9,005.31x = 64,979,530.55
5. Step 5: Solve for x
   x = 64,979,530.55/9,005.31
6. Step 6: Final answer
   x = 7,215.69