Finding the Fourth Proportional to 5,111.53, 7,054.56 and 3,121.67

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.53 : 7,054.56 = 3,121.67 : x
2. Step 2: Convert to fraction form
   5,111.53/7,054.56 = 3,121.67/x
3. Step 3: Cross multiply
   5,111.53x = 7,054.56 × 3,121.67
4. Step 4: Simplify right side
   5,111.53x = 22,021,973.04
5. Step 5: Solve for x
   x = 22,021,973.04/5,111.53
6. Step 6: Final answer
   x = 4,308.30