Finding the Fourth Proportional to 13,878.30, 19,153.29 and 7,908.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,878.30 : 19,153.29 = 7,908.72 : x
2. Step 2: Convert to fraction form
   13,878.30/19,153.29 = 7,908.72/x
3. Step 3: Cross multiply
   13,878.30x = 19,153.29 × 7,908.72
4. Step 4: Simplify right side
   13,878.30x = 151,478,007.69
5. Step 5: Solve for x
   x = 151,478,007.69/13,878.30
6. Step 6: Final answer
   x = 10,914.74