Finding the Fourth Proportional to 5,111.49, 7,054.80 and 3,123.21

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.49 : 7,054.80 = 3,123.21 : x
2. Step 2: Convert to fraction form
   5,111.49/7,054.80 = 3,123.21/x
3. Step 3: Cross multiply
   5,111.49x = 7,054.80 × 3,123.21
4. Step 4: Simplify right side
   5,111.49x = 22,033,621.91
5. Step 5: Solve for x
   x = 22,033,621.91/5,111.49
6. Step 6: Final answer
   x = 4,310.61