Finding the Fourth Proportional to 12,622.96, 17,407.87 and 9,976.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,622.96 : 17,407.87 = 9,976.69 : x
2. Step 2: Convert to fraction form
   12,622.96/17,407.87 = 9,976.69/x
3. Step 3: Cross multiply
   12,622.96x = 17,407.87 × 9,976.69
4. Step 4: Simplify right side
   12,622.96x = 173,672,922.55
5. Step 5: Solve for x
   x = 173,672,922.55/12,622.96
6. Step 6: Final answer
   x = 13,758.49