Finding the Fourth Proportional to 15,379.35, 21,222.72 and 8,665.37

Step by Step Solution

1. Step 1: Write the proportion equation
   15,379.35 : 21,222.72 = 8,665.37 : x
2. Step 2: Convert to fraction form
   15,379.35/21,222.72 = 8,665.37/x
3. Step 3: Cross multiply
   15,379.35x = 21,222.72 × 8,665.37
4. Step 4: Simplify right side
   15,379.35x = 183,902,741.77
5. Step 5: Solve for x
   x = 183,902,741.77/15,379.35
6. Step 6: Final answer
   x = 11,957.77