Finding the Fourth Proportional to 8,978.65, 13,463.47 and 5,231.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.65 : 13,463.47 = 5,231.64 : x
2. Step 2: Convert to fraction form
   8,978.65/13,463.47 = 5,231.64/x
3. Step 3: Cross multiply
   8,978.65x = 13,463.47 × 5,231.64
4. Step 4: Simplify right side
   8,978.65x = 70,436,061.85
5. Step 5: Solve for x
   x = 70,436,061.85/8,978.65
6. Step 6: Final answer
   x = 7,844.84