Finding the Fourth Proportional to 7,142.74, 9,856.54 and 3,955.98

Step by Step Solution

1. Step 1: Write the proportion equation
   7,142.74 : 9,856.54 = 3,955.98 : x
2. Step 2: Convert to fraction form
   7,142.74/9,856.54 = 3,955.98/x
3. Step 3: Cross multiply
   7,142.74x = 9,856.54 × 3,955.98
4. Step 4: Simplify right side
   7,142.74x = 38,992,287.83
5. Step 5: Solve for x
   x = 38,992,287.83/7,142.74
6. Step 6: Final answer
   x = 5,459.01