Finding the Fourth Proportional to 5,111.78, 7,054.22 and 2,988.77

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.78 : 7,054.22 = 2,988.77 : x
2. Step 2: Convert to fraction form
   5,111.78/7,054.22 = 2,988.77/x
3. Step 3: Cross multiply
   5,111.78x = 7,054.22 × 2,988.77
4. Step 4: Simplify right side
   5,111.78x = 21,083,390.89
5. Step 5: Solve for x
   x = 21,083,390.89/5,111.78
6. Step 6: Final answer
   x = 4,124.48