Finding the Fourth Proportional to 15,821.42, 21,840.72 and 10,164.38

Step by Step Solution

1. Step 1: Write the proportion equation
   15,821.42 : 21,840.72 = 10,164.38 : x
2. Step 2: Convert to fraction form
   15,821.42/21,840.72 = 10,164.38/x
3. Step 3: Cross multiply
   15,821.42x = 21,840.72 × 10,164.38
4. Step 4: Simplify right side
   15,821.42x = 221,997,377.55
5. Step 5: Solve for x
   x = 221,997,377.55/15,821.42
6. Step 6: Final answer
   x = 14,031.44