Finding the Fourth Proportional to 13,046.72, 19,511.04 and 8,355.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,046.72 : 19,511.04 = 8,355.20 : x
2. Step 2: Convert to fraction form
   13,046.72/19,511.04 = 8,355.20/x
3. Step 3: Cross multiply
   13,046.72x = 19,511.04 × 8,355.20
4. Step 4: Simplify right side
   13,046.72x = 163,018,641.41
5. Step 5: Solve for x
   x = 163,018,641.41/13,046.72
6. Step 6: Final answer
   x = 12,494.99