Finding the Fourth Proportional to 12,191.37, 16,818.29 and 7,940.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,191.37 : 16,818.29 = 7,940.90 : x
2. Step 2: Convert to fraction form
   12,191.37/16,818.29 = 7,940.90/x
3. Step 3: Cross multiply
   12,191.37x = 16,818.29 × 7,940.90
4. Step 4: Simplify right side
   12,191.37x = 133,552,235.27
5. Step 5: Solve for x
   x = 133,552,235.27/12,191.37
6. Step 6: Final answer
   x = 10,954.65