Finding the Fourth Proportional to 2,801.72, 3,866.46 and 2,101.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,801.72 : 3,866.46 = 2,101.88 : x
2. Step 2: Convert to fraction form
   2,801.72/3,866.46 = 2,101.88/x
3. Step 3: Cross multiply
   2,801.72x = 3,866.46 × 2,101.88
4. Step 4: Simplify right side
   2,801.72x = 8,126,834.94
5. Step 5: Solve for x
   x = 8,126,834.94/2,801.72
6. Step 6: Final answer
   x = 2,900.66