Finding the Fourth Proportional to 13,015.53, 17,951.72 and 8,479.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,015.53 : 17,951.72 = 8,479.21 : x
2. Step 2: Convert to fraction form
   13,015.53/17,951.72 = 8,479.21/x
3. Step 3: Cross multiply
   13,015.53x = 17,951.72 × 8,479.21
4. Step 4: Simplify right side
   13,015.53x = 152,216,403.74
5. Step 5: Solve for x
   x = 152,216,403.74/13,015.53
6. Step 6: Final answer
   x = 11,694.98