Finding the Fourth Proportional to 19,038.86, 28,574.69 and 13,199.57

Step by Step Solution

1. Step 1: Write the proportion equation
   19,038.86 : 28,574.69 = 13,199.57 : x
2. Step 2: Convert to fraction form
   19,038.86/28,574.69 = 13,199.57/x
3. Step 3: Cross multiply
   19,038.86x = 28,574.69 × 13,199.57
4. Step 4: Simplify right side
   19,038.86x = 377,173,620.88
5. Step 5: Solve for x
   x = 377,173,620.88/19,038.86
6. Step 6: Final answer
   x = 19,810.73