Finding the Fourth Proportional to 12,651.96, 18,978.01 and 5,256.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,651.96 : 18,978.01 = 5,256.43 : x
2. Step 2: Convert to fraction form
   12,651.96/18,978.01 = 5,256.43/x
3. Step 3: Cross multiply
   12,651.96x = 18,978.01 × 5,256.43
4. Step 4: Simplify right side
   12,651.96x = 99,756,581.10
5. Step 5: Solve for x
   x = 99,756,581.10/12,651.96
6. Step 6: Final answer
   x = 7,884.67