Finding the Fourth Proportional to 21,018.57, 31,462.25 and 15,085.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.57 : 31,462.25 = 15,085.43 : x
2. Step 2: Convert to fraction form
   21,018.57/31,462.25 = 15,085.43/x
3. Step 3: Cross multiply
   21,018.57x = 31,462.25 × 15,085.43
4. Step 4: Simplify right side
   21,018.57x = 474,621,337.28
5. Step 5: Solve for x
   x = 474,621,337.28/21,018.57
6. Step 6: Final answer
   x = 22,581.05