Finding the Fourth Proportional to 12,785.90, 17,644.74 and 7,196.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,785.90 : 17,644.74 = 7,196.90 : x
2. Step 2: Convert to fraction form
   12,785.90/17,644.74 = 7,196.90/x
3. Step 3: Cross multiply
   12,785.90x = 17,644.74 × 7,196.90
4. Step 4: Simplify right side
   12,785.90x = 126,987,429.31
5. Step 5: Solve for x
   x = 126,987,429.31/12,785.90
6. Step 6: Final answer
   x = 9,931.83