Finding the Fourth Proportional to 12,845.50, 17,728.23 and 7,256.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,845.50 : 17,728.23 = 7,256.86 : x
2. Step 2: Convert to fraction form
   12,845.50/17,728.23 = 7,256.86/x
3. Step 3: Cross multiply
   12,845.50x = 17,728.23 × 7,256.86
4. Step 4: Simplify right side
   12,845.50x = 128,651,283.16
5. Step 5: Solve for x
   x = 128,651,283.16/12,845.50
6. Step 6: Final answer
   x = 10,015.28