Finding the Fourth Proportional to 12,974.80, 17,905.72 and 7,311.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,974.80 : 17,905.72 = 7,311.80 : x
2. Step 2: Convert to fraction form
   12,974.80/17,905.72 = 7,311.80/x
3. Step 3: Cross multiply
   12,974.80x = 17,905.72 × 7,311.80
4. Step 4: Simplify right side
   12,974.80x = 130,923,043.50
5. Step 5: Solve for x
   x = 130,923,043.50/12,974.80
6. Step 6: Final answer
   x = 10,090.56