Finding the Fourth Proportional to 12,945.98, 17,865.20 and 7,280.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.98 : 17,865.20 = 7,280.80 : x
2. Step 2: Convert to fraction form
   12,945.98/17,865.20 = 7,280.80/x
3. Step 3: Cross multiply
   12,945.98x = 17,865.20 × 7,280.80
4. Step 4: Simplify right side
   12,945.98x = 130,072,948.16
5. Step 5: Solve for x
   x = 130,072,948.16/12,945.98
6. Step 6: Final answer
   x = 10,047.36