Finding the Fourth Proportional to 28,481.73, 42,731.73 and 13,691.73

Step by Step Solution

1. Step 1: Write the proportion equation
   28,481.73 : 42,731.73 = 13,691.73 : x
2. Step 2: Convert to fraction form
   28,481.73/42,731.73 = 13,691.73/x
3. Step 3: Cross multiply
   28,481.73x = 42,731.73 × 13,691.73
4. Step 4: Simplify right side
   28,481.73x = 585,071,309.59
5. Step 5: Solve for x
   x = 585,071,309.59/28,481.73
6. Step 6: Final answer
   x = 20,541.99