Finding the Fourth Proportional to 9,896.28, 13,656.85 and 5,420.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,896.28 : 13,656.85 = 5,420.04 : x
2. Step 2: Convert to fraction form
   9,896.28/13,656.85 = 5,420.04/x
3. Step 3: Cross multiply
   9,896.28x = 13,656.85 × 5,420.04
4. Step 4: Simplify right side
   9,896.28x = 74,020,673.27
5. Step 5: Solve for x
   x = 74,020,673.27/9,896.28
6. Step 6: Final answer
   x = 7,479.65