Finding the Fourth Proportional to 13,175.72, 19,686.24 and 12,716.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,175.72 : 19,686.24 = 12,716.36 : x
2. Step 2: Convert to fraction form
   13,175.72/19,686.24 = 12,716.36/x
3. Step 3: Cross multiply
   13,175.72x = 19,686.24 × 12,716.36
4. Step 4: Simplify right side
   13,175.72x = 250,337,314.89
5. Step 5: Solve for x
   x = 250,337,314.89/13,175.72
6. Step 6: Final answer
   x = 18,999.90