Finding the Fourth Proportional to 5,111.51, 7,670.16 and 2,771.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.51 : 7,670.16 = 2,771.55 : x
2. Step 2: Convert to fraction form
   5,111.51/7,670.16 = 2,771.55/x
3. Step 3: Cross multiply
   5,111.51x = 7,670.16 × 2,771.55
4. Step 4: Simplify right side
   5,111.51x = 21,258,231.95
5. Step 5: Solve for x
   x = 21,258,231.95/5,111.51
6. Step 6: Final answer
   x = 4,158.90