Finding the Fourth Proportional to 21,779.72, 30,051.38 and 12,823.95

Step by Step Solution

1. Step 1: Write the proportion equation
   21,779.72 : 30,051.38 = 12,823.95 : x
2. Step 2: Convert to fraction form
   21,779.72/30,051.38 = 12,823.95/x
3. Step 3: Cross multiply
   21,779.72x = 30,051.38 × 12,823.95
4. Step 4: Simplify right side
   21,779.72x = 385,377,467.17
5. Step 5: Solve for x
   x = 385,377,467.17/21,779.72
6. Step 6: Final answer
   x = 17,694.33