Finding the Fourth Proportional to 21,799.55, 30,082.47 and 12,369.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,799.55 : 30,082.47 = 12,369.89 : x
2. Step 2: Convert to fraction form
   21,799.55/30,082.47 = 12,369.89/x
3. Step 3: Cross multiply
   21,799.55x = 30,082.47 × 12,369.89
4. Step 4: Simplify right side
   21,799.55x = 372,116,844.83
5. Step 5: Solve for x
   x = 372,116,844.83/21,799.55
6. Step 6: Final answer
   x = 17,069.93