Finding the Fourth Proportional to 21,790.62, 30,061.05 and 12,833.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,790.62 : 30,061.05 = 12,833.83 : x
2. Step 2: Convert to fraction form
   21,790.62/30,061.05 = 12,833.83/x
3. Step 3: Cross multiply
   21,790.62x = 30,061.05 × 12,833.83
4. Step 4: Simplify right side
   21,790.62x = 385,798,405.32
5. Step 5: Solve for x
   x = 385,798,405.32/21,790.62
6. Step 6: Final answer
   x = 17,704.79