Finding the Fourth Proportional to 12,856.80, 19,288.10 and 4,536.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.80 : 19,288.10 = 4,536.89 : x
2. Step 2: Convert to fraction form
   12,856.80/19,288.10 = 4,536.89/x
3. Step 3: Cross multiply
   12,856.80x = 19,288.10 × 4,536.89
4. Step 4: Simplify right side
   12,856.80x = 87,507,868.88
5. Step 5: Solve for x
   x = 87,507,868.88/12,856.80
6. Step 6: Final answer
   x = 6,806.35