Finding the Fourth Proportional to 21,320.56, 29,422.06 and 12,369.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,320.56 : 29,422.06 = 12,369.57 : x
2. Step 2: Convert to fraction form
   21,320.56/29,422.06 = 12,369.57/x
3. Step 3: Cross multiply
   21,320.56x = 29,422.06 × 12,369.57
4. Step 4: Simplify right side
   21,320.56x = 363,938,230.71
5. Step 5: Solve for x
   x = 363,938,230.71/21,320.56
6. Step 6: Final answer
   x = 17,069.83