Finding the Fourth Proportional to 2,101.94, 2,900.82 and 1,392.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.94 : 2,900.82 = 1,392.56 : x
2. Step 2: Convert to fraction form
   2,101.94/2,900.82 = 1,392.56/x
3. Step 3: Cross multiply
   2,101.94x = 2,900.82 × 1,392.56
4. Step 4: Simplify right side
   2,101.94x = 4,039,565.90
5. Step 5: Solve for x
   x = 4,039,565.90/2,101.94
6. Step 6: Final answer
   x = 1,921.83