Finding the Fourth Proportional to 16,513.96, 22,791.90 and 12,742.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,513.96 : 22,791.90 = 12,742.60 : x
2. Step 2: Convert to fraction form
   16,513.96/22,791.90 = 12,742.60/x
3. Step 3: Cross multiply
   16,513.96x = 22,791.90 × 12,742.60
4. Step 4: Simplify right side
   16,513.96x = 290,428,064.94
5. Step 5: Solve for x
   x = 290,428,064.94/16,513.96
6. Step 6: Final answer
   x = 17,586.82