Finding the Fourth Proportional to 3,671.47, 5,065.76 and 2,158.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,671.47 : 5,065.76 = 2,158.79 : x
2. Step 2: Convert to fraction form
   3,671.47/5,065.76 = 2,158.79/x
3. Step 3: Cross multiply
   3,671.47x = 5,065.76 × 2,158.79
4. Step 4: Simplify right side
   3,671.47x = 10,935,901.24
5. Step 5: Solve for x
   x = 10,935,901.24/3,671.47
6. Step 6: Final answer
   x = 2,978.62