Finding the Fourth Proportional to 1,813.56, 2,719.38 and 838.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,813.56 : 2,719.38 = 838.82 : x
2. Step 2: Convert to fraction form
   1,813.56/2,719.38 = 838.82/x
3. Step 3: Cross multiply
   1,813.56x = 2,719.38 × 838.82
4. Step 4: Simplify right side
   1,813.56x = 2,281,070.33
5. Step 5: Solve for x
   x = 2,281,070.33/1,813.56
6. Step 6: Final answer
   x = 1,257.79