Finding the Fourth Proportional to 5,615.70, 7,746.56 and 3,939.62

Step by Step Solution

1. Step 1: Write the proportion equation
   5,615.70 : 7,746.56 = 3,939.62 : x
2. Step 2: Convert to fraction form
   5,615.70/7,746.56 = 3,939.62/x
3. Step 3: Cross multiply
   5,615.70x = 7,746.56 × 3,939.62
4. Step 4: Simplify right side
   5,615.70x = 30,518,502.71
5. Step 5: Solve for x
   x = 30,518,502.71/5,615.70
6. Step 6: Final answer
   x = 5,434.50