Finding the Fourth Proportional to 16,978.60, 23,431.62 and 9,811

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.60 : 23,431.62 = 9,811 : x
2. Step 2: Convert to fraction form
   16,978.60/23,431.62 = 9,811/x
3. Step 3: Cross multiply
   16,978.60x = 23,431.62 × 9,811
4. Step 4: Simplify right side
   16,978.60x = 229,887,623.82
5. Step 5: Solve for x
   x = 229,887,623.82/16,978.60
6. Step 6: Final answer
   x = 13,539.85