Finding the Fourth Proportional to 2,784.72, 4,177.89 and 837.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,784.72 : 4,177.89 = 837.21 : x
2. Step 2: Convert to fraction form
   2,784.72/4,177.89 = 837.21/x
3. Step 3: Cross multiply
   2,784.72x = 4,177.89 × 837.21
4. Step 4: Simplify right side
   2,784.72x = 3,497,771.29
5. Step 5: Solve for x
   x = 3,497,771.29/2,784.72
6. Step 6: Final answer
   x = 1,256.06