Finding the Fourth Proportional to 13,779, 19,017.10 and 8,404.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,779 : 19,017.10 = 8,404.56 : x
2. Step 2: Convert to fraction form
   13,779/19,017.10 = 8,404.56/x
3. Step 3: Cross multiply
   13,779x = 19,017.10 × 8,404.56
4. Step 4: Simplify right side
   13,779x = 159,830,357.98
5. Step 5: Solve for x
   x = 159,830,357.98/13,779
6. Step 6: Final answer
   x = 11,599.56