Finding the Fourth Proportional to 16,716.56, 23,065.80 and 9,640.40

Step by Step Solution

1. Step 1: Write the proportion equation
   16,716.56 : 23,065.80 = 9,640.40 : x
2. Step 2: Convert to fraction form
   16,716.56/23,065.80 = 9,640.40/x
3. Step 3: Cross multiply
   16,716.56x = 23,065.80 × 9,640.40
4. Step 4: Simplify right side
   16,716.56x = 222,363,538.32
5. Step 5: Solve for x
   x = 222,363,538.32/16,716.56
6. Step 6: Final answer
   x = 13,301.99