Finding the Fourth Proportional to 21,009.82, 28,988.49 and 13,838.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,009.82 : 28,988.49 = 13,838.98 : x
2. Step 2: Convert to fraction form
   21,009.82/28,988.49 = 13,838.98/x
3. Step 3: Cross multiply
   21,009.82x = 28,988.49 × 13,838.98
4. Step 4: Simplify right side
   21,009.82x = 401,171,133.34
5. Step 5: Solve for x
   x = 401,171,133.34/21,009.82
6. Step 6: Final answer
   x = 19,094.46