Finding the Fourth Proportional to 12,920.45, 17,830.41 and 7,256.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.45 : 17,830.41 = 7,256.42 : x
2. Step 2: Convert to fraction form
   12,920.45/17,830.41 = 7,256.42/x
3. Step 3: Cross multiply
   12,920.45x = 17,830.41 × 7,256.42
4. Step 4: Simplify right side
   12,920.45x = 129,384,988.31
5. Step 5: Solve for x
   x = 129,384,988.31/12,920.45
6. Step 6: Final answer
   x = 10,013.97