Finding the Fourth Proportional to 3,711.81, 5,122.86 and 2,118.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,711.81 : 5,122.86 = 2,118.45 : x
2. Step 2: Convert to fraction form
   3,711.81/5,122.86 = 2,118.45/x
3. Step 3: Cross multiply
   3,711.81x = 5,122.86 × 2,118.45
4. Step 4: Simplify right side
   3,711.81x = 10,852,522.77
5. Step 5: Solve for x
   x = 10,852,522.77/3,711.81
6. Step 6: Final answer
   x = 2,923.78