Finding the Fourth Proportional to 20,830.72, 31,219.24 and 7,667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,830.72 : 31,219.24 = 7,667.50 : x
2. Step 2: Convert to fraction form
   20,830.72/31,219.24 = 7,667.50/x
3. Step 3: Cross multiply
   20,830.72x = 31,219.24 × 7,667.50
4. Step 4: Simplify right side
   20,830.72x = 239,373,522.70
5. Step 5: Solve for x
   x = 239,373,522.70/20,830.72
6. Step 6: Final answer
   x = 11,491.37