Finding the Fourth Proportional to 21,168.35, 31,741.18 and 7,123.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,168.35 : 31,741.18 = 7,123.71 : x
2. Step 2: Convert to fraction form
   21,168.35/31,741.18 = 7,123.71/x
3. Step 3: Cross multiply
   21,168.35x = 31,741.18 × 7,123.71
4. Step 4: Simplify right side
   21,168.35x = 226,115,062.60
5. Step 5: Solve for x
   x = 226,115,062.60/21,168.35
6. Step 6: Final answer
   x = 10,681.75