Finding the Fourth Proportional to 16,721.86, 23,076.42 and 9,168.88

Step by Step Solution

1. Step 1: Write the proportion equation
   16,721.86 : 23,076.42 = 9,168.88 : x
2. Step 2: Convert to fraction form
   16,721.86/23,076.42 = 9,168.88/x
3. Step 3: Cross multiply
   16,721.86x = 23,076.42 × 9,168.88
4. Step 4: Simplify right side
   16,721.86x = 211,584,925.81
5. Step 5: Solve for x
   x = 211,584,925.81/16,721.86
6. Step 6: Final answer
   x = 12,653.19