Finding the Fourth Proportional to 12,381, 17,085.78 and 6,791.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,381 : 17,085.78 = 6,791.88 : x
2. Step 2: Convert to fraction form
   12,381/17,085.78 = 6,791.88/x
3. Step 3: Cross multiply
   12,381x = 17,085.78 × 6,791.88
4. Step 4: Simplify right side
   12,381x = 116,044,567.47
5. Step 5: Solve for x
   x = 116,044,567.47/12,381
6. Step 6: Final answer
   x = 9,372.79