Finding the Fourth Proportional to 8,756.30, 12,086.40 and 5,400.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,756.30 : 12,086.40 = 5,400.18 : x
2. Step 2: Convert to fraction form
   8,756.30/12,086.40 = 5,400.18/x
3. Step 3: Cross multiply
   8,756.30x = 12,086.40 × 5,400.18
4. Step 4: Simplify right side
   8,756.30x = 65,268,735.55
5. Step 5: Solve for x
   x = 65,268,735.55/8,756.30
6. Step 6: Final answer
   x = 7,453.92