Finding the Fourth Proportional to 19,210.75, 28,820.98 and 8,111.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,210.75 : 28,820.98 = 8,111.72 : x
2. Step 2: Convert to fraction form
   19,210.75/28,820.98 = 8,111.72/x
3. Step 3: Cross multiply
   19,210.75x = 28,820.98 × 8,111.72
4. Step 4: Simplify right side
   19,210.75x = 233,787,719.89
5. Step 5: Solve for x
   x = 233,787,719.89/19,210.75
6. Step 6: Final answer
   x = 12,169.63