Finding the Fourth Proportional to 5,109.21, 7,050.51 and 3,123.09

Step by Step Solution

1. Step 1: Write the proportion equation
   5,109.21 : 7,050.51 = 3,123.09 : x
2. Step 2: Convert to fraction form
   5,109.21/7,050.51 = 3,123.09/x
3. Step 3: Cross multiply
   5,109.21x = 7,050.51 × 3,123.09
4. Step 4: Simplify right side
   5,109.21x = 22,019,377.28
5. Step 5: Solve for x
   x = 22,019,377.28/5,109.21
6. Step 6: Final answer
   x = 4,309.74