Finding the Fourth Proportional to 21,722.33, 29,980.04 and 13,765.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,722.33 : 29,980.04 = 13,765.30 : x
2. Step 2: Convert to fraction form
   21,722.33/29,980.04 = 13,765.30/x
3. Step 3: Cross multiply
   21,722.33x = 29,980.04 × 13,765.30
4. Step 4: Simplify right side
   21,722.33x = 412,684,025.89
5. Step 5: Solve for x
   x = 412,684,025.89/21,722.33
6. Step 6: Final answer
   x = 18,998.15