Finding the Fourth Proportional to 12,800.50, 19,208.31 and 5,404.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,800.50 : 19,208.31 = 5,404.48 : x
2. Step 2: Convert to fraction form
   12,800.50/19,208.31 = 5,404.48/x
3. Step 3: Cross multiply
   12,800.50x = 19,208.31 × 5,404.48
4. Step 4: Simplify right side
   12,800.50x = 103,810,927.23
5. Step 5: Solve for x
   x = 103,810,927.23/12,800.50
6. Step 6: Final answer
   x = 8,109.91