Finding the Fourth Proportional to 10,986.94, 16,486.34 and 7,290.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,986.94 : 16,486.34 = 7,290.91 : x
2. Step 2: Convert to fraction form
   10,986.94/16,486.34 = 7,290.91/x
3. Step 3: Cross multiply
   10,986.94x = 16,486.34 × 7,290.91
4. Step 4: Simplify right side
   10,986.94x = 120,200,405.32
5. Step 5: Solve for x
   x = 120,200,405.32/10,986.94
6. Step 6: Final answer
   x = 10,940.30