Finding the Fourth Proportional to 13,878.77, 19,153.04 and 7,911

Step by Step Solution

1. Step 1: Write the proportion equation
   13,878.77 : 19,153.04 = 7,911 : x
2. Step 2: Convert to fraction form
   13,878.77/19,153.04 = 7,911/x
3. Step 3: Cross multiply
   13,878.77x = 19,153.04 × 7,911
4. Step 4: Simplify right side
   13,878.77x = 151,519,659.89
5. Step 5: Solve for x
   x = 151,519,659.89/13,878.77
6. Step 6: Final answer
   x = 10,917.37