Finding the Fourth Proportional to 21,779.38, 30,061.01 and 12,823.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,779.38 : 30,061.01 = 12,823.61 : x
2. Step 2: Convert to fraction form
   21,779.38/30,061.01 = 12,823.61/x
3. Step 3: Cross multiply
   21,779.38x = 30,061.01 × 12,823.61
4. Step 4: Simplify right side
   21,779.38x = 385,490,604.33
5. Step 5: Solve for x
   x = 385,490,604.33/21,779.38
6. Step 6: Final answer
   x = 17,699.80