Finding the Fourth Proportional to 7,112.42, 9,815.15 and 3,968.61

Step by Step Solution

1. Step 1: Write the proportion equation
   7,112.42 : 9,815.15 = 3,968.61 : x
2. Step 2: Convert to fraction form
   7,112.42/9,815.15 = 3,968.61/x
3. Step 3: Cross multiply
   7,112.42x = 9,815.15 × 3,968.61
4. Step 4: Simplify right side
   7,112.42x = 38,952,530.77
5. Step 5: Solve for x
   x = 38,952,530.77/7,112.42
6. Step 6: Final answer
   x = 5,476.69