Finding the Fourth Proportional to 5,377.82, 7,421.37 and 3,139.79

Step by Step Solution

1. Step 1: Write the proportion equation
   5,377.82 : 7,421.37 = 3,139.79 : x
2. Step 2: Convert to fraction form
   5,377.82/7,421.37 = 3,139.79/x
3. Step 3: Cross multiply
   5,377.82x = 7,421.37 × 3,139.79
4. Step 4: Simplify right side
   5,377.82x = 23,301,543.31
5. Step 5: Solve for x
   x = 23,301,543.31/5,377.82
6. Step 6: Final answer
   x = 4,332.90