Finding the Fourth Proportional to 20,830.71, 31,219.23 and 7,667.49

Step by Step Solution

1. Step 1: Write the proportion equation
   20,830.71 : 31,219.23 = 7,667.49 : x
2. Step 2: Convert to fraction form
   20,830.71/31,219.23 = 7,667.49/x
3. Step 3: Cross multiply
   20,830.71x = 31,219.23 × 7,667.49
4. Step 4: Simplify right side
   20,830.71x = 239,373,133.83
5. Step 5: Solve for x
   x = 239,373,133.83/20,830.71
6. Step 6: Final answer
   x = 11,491.36