Finding the Fourth Proportional to 12,814.48, 19,196.84 and 8,418.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,814.48 : 19,196.84 = 8,418.60 : x
2. Step 2: Convert to fraction form
   12,814.48/19,196.84 = 8,418.60/x
3. Step 3: Cross multiply
   12,814.48x = 19,196.84 × 8,418.60
4. Step 4: Simplify right side
   12,814.48x = 161,610,517.22
5. Step 5: Solve for x
   x = 161,610,517.22/12,814.48
6. Step 6: Final answer
   x = 12,611.55