Finding the Fourth Proportional to 12,900.45, 17,799.90 and 8,656.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.45 : 17,799.90 = 8,656.88 : x
2. Step 2: Convert to fraction form
   12,900.45/17,799.90 = 8,656.88/x
3. Step 3: Cross multiply
   12,900.45x = 17,799.90 × 8,656.88
4. Step 4: Simplify right side
   12,900.45x = 154,091,525.54
5. Step 5: Solve for x
   x = 154,091,525.54/12,900.45
6. Step 6: Final answer
   x = 11,944.66