Finding the Fourth Proportional to 8,971.55, 12,386.48 and 5,786.43

Step by Step Solution

1. Step 1: Write the proportion equation
   8,971.55 : 12,386.48 = 5,786.43 : x
2. Step 2: Convert to fraction form
   8,971.55/12,386.48 = 5,786.43/x
3. Step 3: Cross multiply
   8,971.55x = 12,386.48 × 5,786.43
4. Step 4: Simplify right side
   8,971.55x = 71,673,499.47
5. Step 5: Solve for x
   x = 71,673,499.47/8,971.55
6. Step 6: Final answer
   x = 7,988.98