Finding the Fourth Proportional to 7,890.81, 10,884.72 and 5,057.17

Step by Step Solution

1. Step 1: Write the proportion equation
   7,890.81 : 10,884.72 = 5,057.17 : x
2. Step 2: Convert to fraction form
   7,890.81/10,884.72 = 5,057.17/x
3. Step 3: Cross multiply
   7,890.81x = 10,884.72 × 5,057.17
4. Step 4: Simplify right side
   7,890.81x = 55,045,918.20
5. Step 5: Solve for x
   x = 55,045,918.20/7,890.81
6. Step 6: Final answer
   x = 6,975.96