Finding the Fourth Proportional to 2,005.56, 3,010.56 and 836.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,005.56 : 3,010.56 = 836.40 : x
2. Step 2: Convert to fraction form
   2,005.56/3,010.56 = 836.40/x
3. Step 3: Cross multiply
   2,005.56x = 3,010.56 × 836.40
4. Step 4: Simplify right side
   2,005.56x = 2,518,032.38
5. Step 5: Solve for x
   x = 2,518,032.38/2,005.56
6. Step 6: Final answer
   x = 1,255.53