Finding the Fourth Proportional to 5,377.56, 7,421.90 and 3,139.43

Step by Step Solution

1. Step 1: Write the proportion equation
   5,377.56 : 7,421.90 = 3,139.43 : x
2. Step 2: Convert to fraction form
   5,377.56/7,421.90 = 3,139.43/x
3. Step 3: Cross multiply
   5,377.56x = 7,421.90 × 3,139.43
4. Step 4: Simplify right side
   5,377.56x = 23,300,571.82
5. Step 5: Solve for x
   x = 23,300,571.82/5,377.56
6. Step 6: Final answer
   x = 4,332.92