Finding the Fourth Proportional to 7,113.62, 9,815.89 and 3,969.94

Step by Step Solution

1. Step 1: Write the proportion equation
   7,113.62 : 9,815.89 = 3,969.94 : x
2. Step 2: Convert to fraction form
   7,113.62/9,815.89 = 3,969.94/x
3. Step 3: Cross multiply
   7,113.62x = 9,815.89 × 3,969.94
4. Step 4: Simplify right side
   7,113.62x = 38,968,494.35
5. Step 5: Solve for x
   x = 38,968,494.35/7,113.62
6. Step 6: Final answer
   x = 5,478.01