Finding the Fourth Proportional to 12,945.80, 17,865.42 and 7,281.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.80 : 17,865.42 = 7,281.74 : x
2. Step 2: Convert to fraction form
   12,945.80/17,865.42 = 7,281.74/x
3. Step 3: Cross multiply
   12,945.80x = 17,865.42 × 7,281.74
4. Step 4: Simplify right side
   12,945.80x = 130,091,343.43
5. Step 5: Solve for x
   x = 130,091,343.43/12,945.80
6. Step 6: Final answer
   x = 10,048.92