Finding the Fourth Proportional to 8,238.72, 11,364.20 and 5,406.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,238.72 : 11,364.20 = 5,406.28 : x
2. Step 2: Convert to fraction form
   8,238.72/11,364.20 = 5,406.28/x
3. Step 3: Cross multiply
   8,238.72x = 11,364.20 × 5,406.28
4. Step 4: Simplify right side
   8,238.72x = 61,438,047.18
5. Step 5: Solve for x
   x = 61,438,047.18/8,238.72
6. Step 6: Final answer
   x = 7,457.23