Finding the Fourth Proportional to 21,017.22, 28,994.56 and 13,837.87

Step by Step Solution

1. Step 1: Write the proportion equation
   21,017.22 : 28,994.56 = 13,837.87 : x
2. Step 2: Convert to fraction form
   21,017.22/28,994.56 = 13,837.87/x
3. Step 3: Cross multiply
   21,017.22x = 28,994.56 × 13,837.87
4. Step 4: Simplify right side
   21,017.22x = 401,222,951.99
5. Step 5: Solve for x
   x = 401,222,951.99/21,017.22
6. Step 6: Final answer
   x = 19,090.20