Finding the Fourth Proportional to 2,921.38, 4,379.58 and 1,276.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,921.38 : 4,379.58 = 1,276.70 : x
2. Step 2: Convert to fraction form
   2,921.38/4,379.58 = 1,276.70/x
3. Step 3: Cross multiply
   2,921.38x = 4,379.58 × 1,276.70
4. Step 4: Simplify right side
   2,921.38x = 5,591,387.89
5. Step 5: Solve for x
   x = 5,591,387.89/2,921.38
6. Step 6: Final answer
   x = 1,913.96