Finding the Fourth Proportional to 16,872.65, 23,278.61 and 10,911.86

Step by Step Solution

1. Step 1: Write the proportion equation
   16,872.65 : 23,278.61 = 10,911.86 : x
2. Step 2: Convert to fraction form
   16,872.65/23,278.61 = 10,911.86/x
3. Step 3: Cross multiply
   16,872.65x = 23,278.61 × 10,911.86
4. Step 4: Simplify right side
   16,872.65x = 254,012,844.20
5. Step 5: Solve for x
   x = 254,012,844.20/16,872.65
6. Step 6: Final answer
   x = 15,054.71