Finding the Fourth Proportional to 13,317.49, 18,455.83 and 13,129.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,317.49 : 18,455.83 = 13,129.57 : x
2. Step 2: Convert to fraction form
   13,317.49/18,455.83 = 13,129.57/x
3. Step 3: Cross multiply
   13,317.49x = 18,455.83 × 13,129.57
4. Step 4: Simplify right side
   13,317.49x = 242,317,111.89
5. Step 5: Solve for x
   x = 242,317,111.89/13,317.49
6. Step 6: Final answer
   x = 18,195.40