Finding the Fourth Proportional to 7,231.20, 9,980.12 and 5,250.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,231.20 : 9,980.12 = 5,250.72 : x
2. Step 2: Convert to fraction form
   7,231.20/9,980.12 = 5,250.72/x
3. Step 3: Cross multiply
   7,231.20x = 9,980.12 × 5,250.72
4. Step 4: Simplify right side
   7,231.20x = 52,402,815.69
5. Step 5: Solve for x
   x = 52,402,815.69/7,231.20
6. Step 6: Final answer
   x = 7,246.77