Finding the Fourth Proportional to 5,418.81, 8,141.92 and 5,200.11

Step by Step Solution

1. Step 1: Write the proportion equation
   5,418.81 : 8,141.92 = 5,200.11 : x
2. Step 2: Convert to fraction form
   5,418.81/8,141.92 = 5,200.11/x
3. Step 3: Cross multiply
   5,418.81x = 8,141.92 × 5,200.11
4. Step 4: Simplify right side
   5,418.81x = 42,338,866.61
5. Step 5: Solve for x
   x = 42,338,866.61/5,418.81
6. Step 6: Final answer
   x = 7,813.31