Finding the Fourth Proportional to 1,813.62, 2,719.98 and 838.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,813.62 : 2,719.98 = 838.80 : x
2. Step 2: Convert to fraction form
   1,813.62/2,719.98 = 838.80/x
3. Step 3: Cross multiply
   1,813.62x = 2,719.98 × 838.80
4. Step 4: Simplify right side
   1,813.62x = 2,281,519.22
5. Step 5: Solve for x
   x = 2,281,519.22/1,813.62
6. Step 6: Final answer
   x = 1,257.99