Finding the Fourth Proportional to 21,965.59, 30,314.69 and 12,535.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,965.59 : 30,314.69 = 12,535.57 : x
2. Step 2: Convert to fraction form
   21,965.59/30,314.69 = 12,535.57/x
3. Step 3: Cross multiply
   21,965.59x = 30,314.69 × 12,535.57
4. Step 4: Simplify right side
   21,965.59x = 380,011,855.85
5. Step 5: Solve for x
   x = 380,011,855.85/21,965.59
6. Step 6: Final answer
   x = 17,300.33