Finding the Fourth Proportional to 9,278.72, 13,917.72 and 3,039.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,278.72 : 13,917.72 = 3,039.20 : x
2. Step 2: Convert to fraction form
   9,278.72/13,917.72 = 3,039.20/x
3. Step 3: Cross multiply
   9,278.72x = 13,917.72 × 3,039.20
4. Step 4: Simplify right side
   9,278.72x = 42,298,734.62
5. Step 5: Solve for x
   x = 42,298,734.62/9,278.72
6. Step 6: Final answer
   x = 4,558.68