Finding the Fourth Proportional to 20,977.24, 31,469.12 and 7,123

Step by Step Solution

1. Step 1: Write the proportion equation
   20,977.24 : 31,469.12 = 7,123 : x
2. Step 2: Convert to fraction form
   20,977.24/31,469.12 = 7,123/x
3. Step 3: Cross multiply
   20,977.24x = 31,469.12 × 7,123
4. Step 4: Simplify right side
   20,977.24x = 224,154,541.76
5. Step 5: Solve for x
   x = 224,154,541.76/20,977.24
6. Step 6: Final answer
   x = 10,685.61