Finding the Fourth Proportional to 12,961.12, 17,872.56 and 8,488.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,961.12 : 17,872.56 = 8,488.80 : x
2. Step 2: Convert to fraction form
   12,961.12/17,872.56 = 8,488.80/x
3. Step 3: Cross multiply
   12,961.12x = 17,872.56 × 8,488.80
4. Step 4: Simplify right side
   12,961.12x = 151,716,587.33
5. Step 5: Solve for x
   x = 151,716,587.33/12,961.12
6. Step 6: Final answer
   x = 11,705.52