Finding the Fourth Proportional to 5,404.30, 8,105.85 and 4,428.70

Step by Step Solution

1. Step 1: Write the proportion equation
   5,404.30 : 8,105.85 = 4,428.70 : x
2. Step 2: Convert to fraction form
   5,404.30/8,105.85 = 4,428.70/x
3. Step 3: Cross multiply
   5,404.30x = 8,105.85 × 4,428.70
4. Step 4: Simplify right side
   5,404.30x = 35,898,377.90
5. Step 5: Solve for x
   x = 35,898,377.90/5,404.30
6. Step 6: Final answer
   x = 6,642.56