Finding the Fourth Proportional to 5,380.92, 8,082.72 and 5,235.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,380.92 : 8,082.72 = 5,235.12 : x
2. Step 2: Convert to fraction form
   5,380.92/8,082.72 = 5,235.12/x
3. Step 3: Cross multiply
   5,380.92x = 8,082.72 × 5,235.12
4. Step 4: Simplify right side
   5,380.92x = 42,314,009.13
5. Step 5: Solve for x
   x = 42,314,009.13/5,380.92
6. Step 6: Final answer
   x = 7,863.71