Finding the Fourth Proportional to 21,182.10, 31,752.50 and 10,085.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,182.10 : 31,752.50 = 10,085.81 : x
2. Step 2: Convert to fraction form
   21,182.10/31,752.50 = 10,085.81/x
3. Step 3: Cross multiply
   21,182.10x = 31,752.50 × 10,085.81
4. Step 4: Simplify right side
   21,182.10x = 320,249,472.83
5. Step 5: Solve for x
   x = 320,249,472.83/21,182.10
6. Step 6: Final answer
   x = 15,118.87