Finding the Fourth Proportional to 9,954.18, 13,736.78 and 5,478.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,954.18 : 13,736.78 = 5,478.26 : x
2. Step 2: Convert to fraction form
   9,954.18/13,736.78 = 5,478.26/x
3. Step 3: Cross multiply
   9,954.18x = 13,736.78 × 5,478.26
4. Step 4: Simplify right side
   9,954.18x = 75,253,556.33
5. Step 5: Solve for x
   x = 75,253,556.33/9,954.18
6. Step 6: Final answer
   x = 7,560.00