Finding the Fourth Proportional to 16,812.72, 23,179.86 and 13,776.55

Step by Step Solution

1. Step 1: Write the proportion equation
   16,812.72 : 23,179.86 = 13,776.55 : x
2. Step 2: Convert to fraction form
   16,812.72/23,179.86 = 13,776.55/x
3. Step 3: Cross multiply
   16,812.72x = 23,179.86 × 13,776.55
4. Step 4: Simplify right side
   16,812.72x = 319,338,500.28
5. Step 5: Solve for x
   x = 319,338,500.28/16,812.72
6. Step 6: Final answer
   x = 18,993.86