Finding the Fourth Proportional to 7,443.91, 10,272.76 and 4,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,443.91 : 10,272.76 = 4,086.78 : x
2. Step 2: Convert to fraction form
   7,443.91/10,272.76 = 4,086.78/x
3. Step 3: Cross multiply
   7,443.91x = 10,272.76 × 4,086.78
4. Step 4: Simplify right side
   7,443.91x = 41,982,438.32
5. Step 5: Solve for x
   x = 41,982,438.32/7,443.91
6. Step 6: Final answer
   x = 5,639.84