Finding the Fourth Proportional to 12,856.77, 19,263.15 and 7,017.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.77 : 19,263.15 = 7,017.48 : x
2. Step 2: Convert to fraction form
   12,856.77/19,263.15 = 7,017.48/x
3. Step 3: Cross multiply
   12,856.77x = 19,263.15 × 7,017.48
4. Step 4: Simplify right side
   12,856.77x = 135,178,769.86
5. Step 5: Solve for x
   x = 135,178,769.86/12,856.77
6. Step 6: Final answer
   x = 10,514.21