Finding the Fourth Proportional to 5,485.42, 8,215.83 and 5,300.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,485.42 : 8,215.83 = 5,300.89 : x
2. Step 2: Convert to fraction form
   5,485.42/8,215.83 = 5,300.89/x
3. Step 3: Cross multiply
   5,485.42x = 8,215.83 × 5,300.89
4. Step 4: Simplify right side
   5,485.42x = 43,551,236.76
5. Step 5: Solve for x
   x = 43,551,236.76/5,485.42
6. Step 6: Final answer
   x = 7,939.45