Finding the Fourth Proportional to 15,628.69, 21,567.40 and 8,555.05

Step by Step Solution

1. Step 1: Write the proportion equation
   15,628.69 : 21,567.40 = 8,555.05 : x
2. Step 2: Convert to fraction form
   15,628.69/21,567.40 = 8,555.05/x
3. Step 3: Cross multiply
   15,628.69x = 21,567.40 × 8,555.05
4. Step 4: Simplify right side
   15,628.69x = 184,510,185.37
5. Step 5: Solve for x
   x = 184,510,185.37/15,628.69
6. Step 6: Final answer
   x = 11,805.86