Finding the Fourth Proportional to 21,131.82, 31,723.65 and 13,373.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.82 : 31,723.65 = 13,373.10 : x
2. Step 2: Convert to fraction form
   21,131.82/31,723.65 = 13,373.10/x
3. Step 3: Cross multiply
   21,131.82x = 31,723.65 × 13,373.10
4. Step 4: Simplify right side
   21,131.82x = 424,243,543.82
5. Step 5: Solve for x
   x = 424,243,543.82/21,131.82
6. Step 6: Final answer
   x = 20,076.05