Finding the Fourth Proportional to 20,751.39, 31,139.82 and 10,897.74

Step by Step Solution

1. Step 1: Write the proportion equation
   20,751.39 : 31,139.82 = 10,897.74 : x
2. Step 2: Convert to fraction form
   20,751.39/31,139.82 = 10,897.74/x
3. Step 3: Cross multiply
   20,751.39x = 31,139.82 × 10,897.74
4. Step 4: Simplify right side
   20,751.39x = 339,353,662.01
5. Step 5: Solve for x
   x = 339,353,662.01/20,751.39
6. Step 6: Final answer
   x = 16,353.30