Finding the Fourth Proportional to 2,138.89, 3,210.15 and 841.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138.89 : 3,210.15 = 841.27 : x
2. Step 2: Convert to fraction form
   2,138.89/3,210.15 = 841.27/x
3. Step 3: Cross multiply
   2,138.89x = 3,210.15 × 841.27
4. Step 4: Simplify right side
   2,138.89x = 2,700,602.89
5. Step 5: Solve for x
   x = 2,700,602.89/2,138.89
6. Step 6: Final answer
   x = 1,262.62