Finding the Fourth Proportional to 16,678.28, 23,015.06 and 9,123.10

Step by Step Solution

1. Step 1: Write the proportion equation
   16,678.28 : 23,015.06 = 9,123.10 : x
2. Step 2: Convert to fraction form
   16,678.28/23,015.06 = 9,123.10/x
3. Step 3: Cross multiply
   16,678.28x = 23,015.06 × 9,123.10
4. Step 4: Simplify right side
   16,678.28x = 209,968,693.89
5. Step 5: Solve for x
   x = 209,968,693.89/16,678.28
6. Step 6: Final answer
   x = 12,589.35