Finding the Fourth Proportional to 8,911.25, 12,300.77 and 5,185.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911.25 : 12,300.77 = 5,185.25 : x
2. Step 2: Convert to fraction form
   8,911.25/12,300.77 = 5,185.25/x
3. Step 3: Cross multiply
   8,911.25x = 12,300.77 × 5,185.25
4. Step 4: Simplify right side
   8,911.25x = 63,782,567.64
5. Step 5: Solve for x
   x = 63,782,567.64/8,911.25
6. Step 6: Final answer
   x = 7,157.53