Finding the Fourth Proportional to 7,910.53, 10,911.76 and 5,221.76

Step by Step Solution

1. Step 1: Write the proportion equation
   7,910.53 : 10,911.76 = 5,221.76 : x
2. Step 2: Convert to fraction form
   7,910.53/10,911.76 = 5,221.76/x
3. Step 3: Cross multiply
   7,910.53x = 10,911.76 × 5,221.76
4. Step 4: Simplify right side
   7,910.53x = 56,978,624.63
5. Step 5: Solve for x
   x = 56,978,624.63/7,910.53
6. Step 6: Final answer
   x = 7,202.88