Finding the Fourth Proportional to 21,817.32, 30,110.72 and 13,317.66

Step by Step Solution

1. Step 1: Write the proportion equation
   21,817.32 : 30,110.72 = 13,317.66 : x
2. Step 2: Convert to fraction form
   21,817.32/30,110.72 = 13,317.66/x
3. Step 3: Cross multiply
   21,817.32x = 30,110.72 × 13,317.66
4. Step 4: Simplify right side
   21,817.32x = 401,004,114.17
5. Step 5: Solve for x
   x = 401,004,114.17/21,817.32
6. Step 6: Final answer
   x = 18,380.09