Finding the Fourth Proportional to 13,678.89, 18,876.84 and 7,391.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,678.89 : 18,876.84 = 7,391.25 : x
2. Step 2: Convert to fraction form
   13,678.89/18,876.84 = 7,391.25/x
3. Step 3: Cross multiply
   13,678.89x = 18,876.84 × 7,391.25
4. Step 4: Simplify right side
   13,678.89x = 139,523,443.65
5. Step 5: Solve for x
   x = 139,523,443.65/13,678.89
6. Step 6: Final answer
   x = 10,199.91