Finding the Fourth Proportional to 4,913.05, 7,338.31 and 4,221.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,913.05 : 7,338.31 = 4,221.72 : x
2. Step 2: Convert to fraction form
   4,913.05/7,338.31 = 4,221.72/x
3. Step 3: Cross multiply
   4,913.05x = 7,338.31 × 4,221.72
4. Step 4: Simplify right side
   4,913.05x = 30,980,290.09
5. Step 5: Solve for x
   x = 30,980,290.09/4,913.05
6. Step 6: Final answer
   x = 6,305.71