Finding the Fourth Proportional to 13,082.72, 19,616.79 and 4,315.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,082.72 : 19,616.79 = 4,315.28 : x
2. Step 2: Convert to fraction form
   13,082.72/19,616.79 = 4,315.28/x
3. Step 3: Cross multiply
   13,082.72x = 19,616.79 × 4,315.28
4. Step 4: Simplify right side
   13,082.72x = 84,651,941.55
5. Step 5: Solve for x
   x = 84,651,941.55/13,082.72
6. Step 6: Final answer
   x = 6,470.52