Finding the Fourth Proportional to 3,386.94, 4,671.27 and 2,142.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,386.94 : 4,671.27 = 2,142.78 : x
2. Step 2: Convert to fraction form
   3,386.94/4,671.27 = 2,142.78/x
3. Step 3: Cross multiply
   3,386.94x = 4,671.27 × 2,142.78
4. Step 4: Simplify right side
   3,386.94x = 10,009,503.93
5. Step 5: Solve for x
   x = 10,009,503.93/3,386.94
6. Step 6: Final answer
   x = 2,955.32