Finding the Fourth Proportional to 12,085.06, 18,131.70 and 10,920.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.06 : 18,131.70 = 10,920.50 : x
2. Step 2: Convert to fraction form
   12,085.06/18,131.70 = 10,920.50/x
3. Step 3: Cross multiply
   12,085.06x = 18,131.70 × 10,920.50
4. Step 4: Simplify right side
   12,085.06x = 198,007,229.85
5. Step 5: Solve for x
   x = 198,007,229.85/12,085.06
6. Step 6: Final answer
   x = 16,384.46