Finding the Fourth Proportional to 5,139.68, 7,092.72 and 4,021.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.68 : 7,092.72 = 4,021.76 : x
2. Step 2: Convert to fraction form
   5,139.68/7,092.72 = 4,021.76/x
3. Step 3: Cross multiply
   5,139.68x = 7,092.72 × 4,021.76
4. Step 4: Simplify right side
   5,139.68x = 28,525,217.59
5. Step 5: Solve for x
   x = 28,525,217.59/5,139.68
6. Step 6: Final answer
   x = 5,550.00