Finding the Fourth Proportional to 5,441.10, 8,145.45 and 5,120.70

Step by Step Solution

1. Step 1: Write the proportion equation
   5,441.10 : 8,145.45 = 5,120.70 : x
2. Step 2: Convert to fraction form
   5,441.10/8,145.45 = 5,120.70/x
3. Step 3: Cross multiply
   5,441.10x = 8,145.45 × 5,120.70
4. Step 4: Simplify right side
   5,441.10x = 41,710,405.82
5. Step 5: Solve for x
   x = 41,710,405.82/5,441.10
6. Step 6: Final answer
   x = 7,665.80