Finding the Fourth Proportional to 12,644.98, 17,407.20 and 10,866.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,644.98 : 17,407.20 = 10,866.22 : x
2. Step 2: Convert to fraction form
   12,644.98/17,407.20 = 10,866.22/x
3. Step 3: Cross multiply
   12,644.98x = 17,407.20 × 10,866.22
4. Step 4: Simplify right side
   12,644.98x = 189,150,462.01
5. Step 5: Solve for x
   x = 189,150,462.01/12,644.98
6. Step 6: Final answer
   x = 14,958.54