Finding the Fourth Proportional to 9,896.88, 13,657.56 and 5,420.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,896.88 : 13,657.56 = 5,420.56 : x
2. Step 2: Convert to fraction form
   9,896.88/13,657.56 = 5,420.56/x
3. Step 3: Cross multiply
   9,896.88x = 13,657.56 × 5,420.56
4. Step 4: Simplify right side
   9,896.88x = 74,031,623.43
5. Step 5: Solve for x
   x = 74,031,623.43/9,896.88
6. Step 6: Final answer
   x = 7,480.30