Finding the Fourth Proportional to 5,411.70, 8,100.53 and 5,285.34

Step by Step Solution

1. Step 1: Write the proportion equation
   5,411.70 : 8,100.53 = 5,285.34 : x
2. Step 2: Convert to fraction form
   5,411.70/8,100.53 = 5,285.34/x
3. Step 3: Cross multiply
   5,411.70x = 8,100.53 × 5,285.34
4. Step 4: Simplify right side
   5,411.70x = 42,814,028.80
5. Step 5: Solve for x
   x = 42,814,028.80/5,411.70
6. Step 6: Final answer
   x = 7,911.38