Finding the Fourth Proportional to 28,043.07, 42,073.38 and 8,321.73

Step by Step Solution

1. Step 1: Write the proportion equation
   28,043.07 : 42,073.38 = 8,321.73 : x
2. Step 2: Convert to fraction form
   28,043.07/42,073.38 = 8,321.73/x
3. Step 3: Cross multiply
   28,043.07x = 42,073.38 × 8,321.73
4. Step 4: Simplify right side
   28,043.07x = 350,123,308.55
5. Step 5: Solve for x
   x = 350,123,308.55/28,043.07
6. Step 6: Final answer
   x = 12,485.20