Finding the Fourth Proportional to 10,920.18, 16,382.61 and 3,994.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,920.18 : 16,382.61 = 3,994.50 : x
2. Step 2: Convert to fraction form
   10,920.18/16,382.61 = 3,994.50/x
3. Step 3: Cross multiply
   10,920.18x = 16,382.61 × 3,994.50
4. Step 4: Simplify right side
   10,920.18x = 65,440,335.65
5. Step 5: Solve for x
   x = 65,440,335.65/10,920.18
6. Step 6: Final answer
   x = 5,992.61