Finding the Fourth Proportional to 7,043.61, 9,720.05 and 3,899.82

Step by Step Solution

1. Step 1: Write the proportion equation
   7,043.61 : 9,720.05 = 3,899.82 : x
2. Step 2: Convert to fraction form
   7,043.61/9,720.05 = 3,899.82/x
3. Step 3: Cross multiply
   7,043.61x = 9,720.05 × 3,899.82
4. Step 4: Simplify right side
   7,043.61x = 37,906,425.89
5. Step 5: Solve for x
   x = 37,906,425.89/7,043.61
6. Step 6: Final answer
   x = 5,381.68