Finding the Fourth Proportional to 9,086.43, 13,607.78 and 5,178.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,086.43 : 13,607.78 = 5,178.99 : x
2. Step 2: Convert to fraction form
   9,086.43/13,607.78 = 5,178.99/x
3. Step 3: Cross multiply
   9,086.43x = 13,607.78 × 5,178.99
4. Step 4: Simplify right side
   9,086.43x = 70,474,530.65
5. Step 5: Solve for x
   x = 70,474,530.65/9,086.43
6. Step 6: Final answer
   x = 7,756.02