Finding the Fourth Proportional to 21,111.57, 31,671.18 and 10,018.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,111.57 : 31,671.18 = 10,018.15 : x
2. Step 2: Convert to fraction form
   21,111.57/31,671.18 = 10,018.15/x
3. Step 3: Cross multiply
   21,111.57x = 31,671.18 × 10,018.15
4. Step 4: Simplify right side
   21,111.57x = 317,286,631.92
5. Step 5: Solve for x
   x = 317,286,631.92/21,111.57
6. Step 6: Final answer
   x = 15,029.04