Finding the Fourth Proportional to 12,718.96, 19,026.56 and 10,256.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,718.96 : 19,026.56 = 10,256.56 : x
2. Step 2: Convert to fraction form
   12,718.96/19,026.56 = 10,256.56/x
3. Step 3: Cross multiply
   12,718.96x = 19,026.56 × 10,256.56
4. Step 4: Simplify right side
   12,718.96x = 195,147,054.23
5. Step 5: Solve for x
   x = 195,147,054.23/12,718.96
6. Step 6: Final answer
   x = 15,343.00