Finding the Fourth Proportional to 21,320.42, 29,421.90 and 12,369.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,320.42 : 29,421.90 = 12,369.46 : x
2. Step 2: Convert to fraction form
   21,320.42/29,421.90 = 12,369.46/x
3. Step 3: Cross multiply
   21,320.42x = 29,421.90 × 12,369.46
4. Step 4: Simplify right side
   21,320.42x = 363,933,015.17
5. Step 5: Solve for x
   x = 363,933,015.17/21,320.42
6. Step 6: Final answer
   x = 17,069.69