Finding the Fourth Proportional to 7,173.50, 9,899.69 and 3,986.96

Step by Step Solution

1. Step 1: Write the proportion equation
   7,173.50 : 9,899.69 = 3,986.96 : x
2. Step 2: Convert to fraction form
   7,173.50/9,899.69 = 3,986.96/x
3. Step 3: Cross multiply
   7,173.50x = 9,899.69 × 3,986.96
4. Step 4: Simplify right side
   7,173.50x = 39,469,598.61
5. Step 5: Solve for x
   x = 39,469,598.61/7,173.50
6. Step 6: Final answer
   x = 5,502.14