Finding the Fourth Proportional to 12,890.37, 17,792.55 and 8,907.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,890.37 : 17,792.55 = 8,907.60 : x
2. Step 2: Convert to fraction form
   12,890.37/17,792.55 = 8,907.60/x
3. Step 3: Cross multiply
   12,890.37x = 17,792.55 × 8,907.60
4. Step 4: Simplify right side
   12,890.37x = 158,488,918.38
5. Step 5: Solve for x
   x = 158,488,918.38/12,890.37
6. Step 6: Final answer
   x = 12,295.14