Finding the Fourth Proportional to 16,780.80, 23,155.25 and 10,405.07

Step by Step Solution

1. Step 1: Write the proportion equation
   16,780.80 : 23,155.25 = 10,405.07 : x
2. Step 2: Convert to fraction form
   16,780.80/23,155.25 = 10,405.07/x
3. Step 3: Cross multiply
   16,780.80x = 23,155.25 × 10,405.07
4. Step 4: Simplify right side
   16,780.80x = 240,931,829.32
5. Step 5: Solve for x
   x = 240,931,829.32/16,780.80
6. Step 6: Final answer
   x = 14,357.59