Finding the Fourth Proportional to 9,139.05, 13,709.85 and 3,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.05 : 13,709.85 = 3,216.72 : x
2. Step 2: Convert to fraction form
   9,139.05/13,709.85 = 3,216.72/x
3. Step 3: Cross multiply
   9,139.05x = 13,709.85 × 3,216.72
4. Step 4: Simplify right side
   9,139.05x = 44,100,748.69
5. Step 5: Solve for x
   x = 44,100,748.69/9,139.05
6. Step 6: Final answer
   x = 4,825.53