Finding the Fourth Proportional to 12,880.32, 17,865.72 and 12,538.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,880.32 : 17,865.72 = 12,538.80 : x
2. Step 2: Convert to fraction form
   12,880.32/17,865.72 = 12,538.80/x
3. Step 3: Cross multiply
   12,880.32x = 17,865.72 × 12,538.80
4. Step 4: Simplify right side
   12,880.32x = 224,014,689.94
5. Step 5: Solve for x
   x = 224,014,689.94/12,880.32
6. Step 6: Final answer
   x = 17,392.01