Finding the Fourth Proportional to 16,978.62, 23,431.77 and 9,903.54

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.62 : 23,431.77 = 9,903.54 : x
2. Step 2: Convert to fraction form
   16,978.62/23,431.77 = 9,903.54/x
3. Step 3: Cross multiply
   16,978.62x = 23,431.77 × 9,903.54
4. Step 4: Simplify right side
   16,978.62x = 232,057,471.47
5. Step 5: Solve for x
   x = 232,057,471.47/16,978.62
6. Step 6: Final answer
   x = 13,667.63