Finding the Fourth Proportional to 5,111.52, 7,054.20 and 3,121.56

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.52 : 7,054.20 = 3,121.56 : x
2. Step 2: Convert to fraction form
   5,111.52/7,054.20 = 3,121.56/x
3. Step 3: Cross multiply
   5,111.52x = 7,054.20 × 3,121.56
4. Step 4: Simplify right side
   5,111.52x = 22,020,108.55
5. Step 5: Solve for x
   x = 22,020,108.55/5,111.52
6. Step 6: Final answer
   x = 4,307.94