Finding the Fourth Proportional to 2,921.76, 4,380.21 and 1,277.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,921.76 : 4,380.21 = 1,277.82 : x
2. Step 2: Convert to fraction form
   2,921.76/4,380.21 = 1,277.82/x
3. Step 3: Cross multiply
   2,921.76x = 4,380.21 × 1,277.82
4. Step 4: Simplify right side
   2,921.76x = 5,597,119.94
5. Step 5: Solve for x
   x = 5,597,119.94/2,921.76
6. Step 6: Final answer
   x = 1,915.67