Finding the Fourth Proportional to 8,940.89, 13,412.88 and 3,678.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,940.89 : 13,412.88 = 3,678.79 : x
2. Step 2: Convert to fraction form
   8,940.89/13,412.88 = 3,678.79/x
3. Step 3: Cross multiply
   8,940.89x = 13,412.88 × 3,678.79
4. Step 4: Simplify right side
   8,940.89x = 49,343,150.42
5. Step 5: Solve for x
   x = 49,343,150.42/8,940.89
6. Step 6: Final answer
   x = 5,518.82