Finding the Fourth Proportional to 9,954.72, 13,737.21 and 5,478.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,954.72 : 13,737.21 = 5,478.47 : x
2. Step 2: Convert to fraction form
   9,954.72/13,737.21 = 5,478.47/x
3. Step 3: Cross multiply
   9,954.72x = 13,737.21 × 5,478.47
4. Step 4: Simplify right side
   9,954.72x = 75,258,844.73
5. Step 5: Solve for x
   x = 75,258,844.73/9,954.72
6. Step 6: Final answer
   x = 7,560.12