Finding the Fourth Proportional to 6,221.20, 9,319.50 and 3,748.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,221.20 : 9,319.50 = 3,748.72 : x
2. Step 2: Convert to fraction form
   6,221.20/9,319.50 = 3,748.72/x
3. Step 3: Cross multiply
   6,221.20x = 9,319.50 × 3,748.72
4. Step 4: Simplify right side
   6,221.20x = 34,936,196.04
5. Step 5: Solve for x
   x = 34,936,196.04/6,221.20
6. Step 6: Final answer
   x = 5,615.67