Finding the Fourth Proportional to 12,891.88, 17,794.02 and 7,921

Step by Step Solution

1. Step 1: Write the proportion equation
   12,891.88 : 17,794.02 = 7,921 : x
2. Step 2: Convert to fraction form
   12,891.88/17,794.02 = 7,921/x
3. Step 3: Cross multiply
   12,891.88x = 17,794.02 × 7,921
4. Step 4: Simplify right side
   12,891.88x = 140,946,432.42
5. Step 5: Solve for x
   x = 140,946,432.42/12,891.88
6. Step 6: Final answer
   x = 10,932.96