Finding the Fourth Proportional to 9,217.12, 12,719.76 and 5,238.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,217.12 : 12,719.76 = 5,238.34 : x
2. Step 2: Convert to fraction form
   9,217.12/12,719.76 = 5,238.34/x
3. Step 3: Cross multiply
   9,217.12x = 12,719.76 × 5,238.34
4. Step 4: Simplify right side
   9,217.12x = 66,630,427.60
5. Step 5: Solve for x
   x = 66,630,427.60/9,217.12
6. Step 6: Final answer
   x = 7,228.99