Finding the Fourth Proportional to 20,315.41, 30,475.71 and 7,839

Step by Step Solution

1. Step 1: Write the proportion equation
   20,315.41 : 30,475.71 = 7,839 : x
2. Step 2: Convert to fraction form
   20,315.41/30,475.71 = 7,839/x
3. Step 3: Cross multiply
   20,315.41x = 30,475.71 × 7,839
4. Step 4: Simplify right side
   20,315.41x = 238,899,090.69
5. Step 5: Solve for x
   x = 238,899,090.69/20,315.41
6. Step 6: Final answer
   x = 11,759.50