Finding the Fourth Proportional to 3,932.46, 5,390.18 and 3,877.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,932.46 : 5,390.18 = 3,877.79 : x
2. Step 2: Convert to fraction form
   3,932.46/5,390.18 = 3,877.79/x
3. Step 3: Cross multiply
   3,932.46x = 5,390.18 × 3,877.79
4. Step 4: Simplify right side
   3,932.46x = 20,901,939.76
5. Step 5: Solve for x
   x = 20,901,939.76/3,932.46
6. Step 6: Final answer
   x = 5,315.23