Finding the Fourth Proportional to 20,046.67, 27,664.86 and 12,985.38

Step by Step Solution

1. Step 1: Write the proportion equation
   20,046.67 : 27,664.86 = 12,985.38 : x
2. Step 2: Convert to fraction form
   20,046.67/27,664.86 = 12,985.38/x
3. Step 3: Cross multiply
   20,046.67x = 27,664.86 × 12,985.38
4. Step 4: Simplify right side
   20,046.67x = 359,238,654.82
5. Step 5: Solve for x
   x = 359,238,654.82/20,046.67
6. Step 6: Final answer
   x = 17,920.12