Finding the Fourth Proportional to 12,815.56, 19,223.52 and 5,419.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.56 : 19,223.52 = 5,419.09 : x
2. Step 2: Convert to fraction form
   12,815.56/19,223.52 = 5,419.09/x
3. Step 3: Cross multiply
   12,815.56x = 19,223.52 × 5,419.09
4. Step 4: Simplify right side
   12,815.56x = 104,173,985.00
5. Step 5: Solve for x
   x = 104,173,985.00/12,815.56
6. Step 6: Final answer
   x = 8,128.71