Finding the Fourth Proportional to 11,850.72, 16,356.72 and 7,872

Step by Step Solution

1. Step 1: Write the proportion equation
   11,850.72 : 16,356.72 = 7,872 : x
2. Step 2: Convert to fraction form
   11,850.72/16,356.72 = 7,872/x
3. Step 3: Cross multiply
   11,850.72x = 16,356.72 × 7,872
4. Step 4: Simplify right side
   11,850.72x = 128,760,099.84
5. Step 5: Solve for x
   x = 128,760,099.84/11,850.72
6. Step 6: Final answer
   x = 10,865.17