Finding the Fourth Proportional to 5,450.01, 8,120.87 and 5,185.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,450.01 : 8,120.87 = 5,185.55 : x
2. Step 2: Convert to fraction form
   5,450.01/8,120.87 = 5,185.55/x
3. Step 3: Cross multiply
   5,450.01x = 8,120.87 × 5,185.55
4. Step 4: Simplify right side
   5,450.01x = 42,111,110.90
5. Step 5: Solve for x
   x = 42,111,110.90/5,450.01
6. Step 6: Final answer
   x = 7,726.80