Finding the Fourth Proportional to 16,838.58, 25,279.74 and 12,945.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,838.58 : 25,279.74 = 12,945.72 : x
2. Step 2: Convert to fraction form
   16,838.58/25,279.74 = 12,945.72/x
3. Step 3: Cross multiply
   16,838.58x = 25,279.74 × 12,945.72
4. Step 4: Simplify right side
   16,838.58x = 327,264,435.71
5. Step 5: Solve for x
   x = 327,264,435.71/16,838.58
6. Step 6: Final answer
   x = 19,435.39