Finding the Fourth Proportional to 20,964.72, 31,435.74 and 10,411.59

Step by Step Solution

1. Step 1: Write the proportion equation
   20,964.72 : 31,435.74 = 10,411.59 : x
2. Step 2: Convert to fraction form
   20,964.72/31,435.74 = 10,411.59/x
3. Step 3: Cross multiply
   20,964.72x = 31,435.74 × 10,411.59
4. Step 4: Simplify right side
   20,964.72x = 327,296,036.23
5. Step 5: Solve for x
   x = 327,296,036.23/20,964.72
6. Step 6: Final answer
   x = 15,611.75