Finding the Fourth Proportional to 16,978.03, 23,430.36 and 9,321.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.03 : 23,430.36 = 9,321.60 : x
2. Step 2: Convert to fraction form
   16,978.03/23,430.36 = 9,321.60/x
3. Step 3: Cross multiply
   16,978.03x = 23,430.36 × 9,321.60
4. Step 4: Simplify right side
   16,978.03x = 218,408,443.78
5. Step 5: Solve for x
   x = 218,408,443.78/16,978.03
6. Step 6: Final answer
   x = 12,864.18