Finding the Fourth Proportional to 3,678.75, 5,076.72 and 2,106.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,678.75 : 5,076.72 = 2,106.90 : x
2. Step 2: Convert to fraction form
   3,678.75/5,076.72 = 2,106.90/x
3. Step 3: Cross multiply
   3,678.75x = 5,076.72 × 2,106.90
4. Step 4: Simplify right side
   3,678.75x = 10,696,141.37
5. Step 5: Solve for x
   x = 10,696,141.37/3,678.75
6. Step 6: Final answer
   x = 2,907.55