Finding the Fourth Proportional to 9,940.56, 13,719.96 and 7,578.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,940.56 : 13,719.96 = 7,578.48 : x
2. Step 2: Convert to fraction form
   9,940.56/13,719.96 = 7,578.48/x
3. Step 3: Cross multiply
   9,940.56x = 13,719.96 × 7,578.48
4. Step 4: Simplify right side
   9,940.56x = 103,976,442.46
5. Step 5: Solve for x
   x = 103,976,442.46/9,940.56
6. Step 6: Final answer
   x = 10,459.82