Finding the Fourth Proportional to 21,238.17, 31,858.06 and 10,837.77

Step by Step Solution

1. Step 1: Write the proportion equation
   21,238.17 : 31,858.06 = 10,837.77 : x
2. Step 2: Convert to fraction form
   21,238.17/31,858.06 = 10,837.77/x
3. Step 3: Cross multiply
   21,238.17x = 31,858.06 × 10,837.77
4. Step 4: Simplify right side
   21,238.17x = 345,270,140.54
5. Step 5: Solve for x
   x = 345,270,140.54/21,238.17
6. Step 6: Final answer
   x = 16,257.06