Finding the Fourth Proportional to 16,781.10, 23,152.16 and 10,405.40

Step by Step Solution

1. Step 1: Write the proportion equation
   16,781.10 : 23,152.16 = 10,405.40 : x
2. Step 2: Convert to fraction form
   16,781.10/23,152.16 = 10,405.40/x
3. Step 3: Cross multiply
   16,781.10x = 23,152.16 × 10,405.40
4. Step 4: Simplify right side
   16,781.10x = 240,907,346.82
5. Step 5: Solve for x
   x = 240,907,346.82/16,781.10
6. Step 6: Final answer
   x = 14,355.87