Finding the Fourth Proportional to 9,410.55, 12,986.37 and 5,431.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,410.55 : 12,986.37 = 5,431.56 : x
2. Step 2: Convert to fraction form
   9,410.55/12,986.37 = 5,431.56/x
3. Step 3: Cross multiply
   9,410.55x = 12,986.37 × 5,431.56
4. Step 4: Simplify right side
   9,410.55x = 70,536,247.84
5. Step 5: Solve for x
   x = 70,536,247.84/9,410.55
6. Step 6: Final answer
   x = 7,495.44