Finding the Fourth Proportional to 13,845.89, 19,104.78 and 7,877.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,845.89 : 19,104.78 = 7,877.21 : x
2. Step 2: Convert to fraction form
   13,845.89/19,104.78 = 7,877.21/x
3. Step 3: Cross multiply
   13,845.89x = 19,104.78 × 7,877.21
4. Step 4: Simplify right side
   13,845.89x = 150,492,382.29
5. Step 5: Solve for x
   x = 150,492,382.29/13,845.89
6. Step 6: Final answer
   x = 10,869.10