Finding the Fourth Proportional to 21,173.67, 31,756.05 and 13,654.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,173.67 : 31,756.05 = 13,654.71 : x
2. Step 2: Convert to fraction form
   21,173.67/31,756.05 = 13,654.71/x
3. Step 3: Cross multiply
   21,173.67x = 31,756.05 × 13,654.71
4. Step 4: Simplify right side
   21,173.67x = 433,619,653.50
5. Step 5: Solve for x
   x = 433,619,653.50/21,173.67
6. Step 6: Final answer
   x = 20,479.19