Finding the Fourth Proportional to 7,140.50, 9,853.90 and 3,996.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,140.50 : 9,853.90 = 3,996.72 : x
2. Step 2: Convert to fraction form
   7,140.50/9,853.90 = 3,996.72/x
3. Step 3: Cross multiply
   7,140.50x = 9,853.90 × 3,996.72
4. Step 4: Simplify right side
   7,140.50x = 39,383,279.21
5. Step 5: Solve for x
   x = 39,383,279.21/7,140.50
6. Step 6: Final answer
   x = 5,515.48