Finding the Fourth Proportional to 21,256.38, 31,870.90 and 10,162.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,256.38 : 31,870.90 = 10,162.82 : x
2. Step 2: Convert to fraction form
   21,256.38/31,870.90 = 10,162.82/x
3. Step 3: Cross multiply
   21,256.38x = 31,870.90 × 10,162.82
4. Step 4: Simplify right side
   21,256.38x = 323,898,219.94
5. Step 5: Solve for x
   x = 323,898,219.94/21,256.38
6. Step 6: Final answer
   x = 15,237.69