Finding the Fourth Proportional to 16,978.72, 23,429.34 and 9,904.24

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.72 : 23,429.34 = 9,904.24 : x
2. Step 2: Convert to fraction form
   16,978.72/23,429.34 = 9,904.24/x
3. Step 3: Cross multiply
   16,978.72x = 23,429.34 × 9,904.24
4. Step 4: Simplify right side
   16,978.72x = 232,049,806.40
5. Step 5: Solve for x
   x = 232,049,806.40/16,978.72
6. Step 6: Final answer
   x = 13,667.10