Finding the Fourth Proportional to 19,210.87, 28,809.38 and 8,118.42

Step by Step Solution

1. Step 1: Write the proportion equation
   19,210.87 : 28,809.38 = 8,118.42 : x
2. Step 2: Convert to fraction form
   19,210.87/28,809.38 = 8,118.42/x
3. Step 3: Cross multiply
   19,210.87x = 28,809.38 × 8,118.42
4. Step 4: Simplify right side
   19,210.87x = 233,886,498.15
5. Step 5: Solve for x
   x = 233,886,498.15/19,210.87
6. Step 6: Final answer
   x = 12,174.69