Finding the Fourth Proportional to 13,541.72, 18,648.81 and 12,697.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,541.72 : 18,648.81 = 12,697.89 : x
2. Step 2: Convert to fraction form
   13,541.72/18,648.81 = 12,697.89/x
3. Step 3: Cross multiply
   13,541.72x = 18,648.81 × 12,697.89
4. Step 4: Simplify right side
   13,541.72x = 236,800,538.01
5. Step 5: Solve for x
   x = 236,800,538.01/13,541.72
6. Step 6: Final answer
   x = 17,486.75