Finding the Fourth Proportional to 1,736.59, 2,604.91 and 811.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,736.59 : 2,604.91 = 811.89 : x
2. Step 2: Convert to fraction form
   1,736.59/2,604.91 = 811.89/x
3. Step 3: Cross multiply
   1,736.59x = 2,604.91 × 811.89
4. Step 4: Simplify right side
   1,736.59x = 2,114,899.87
5. Step 5: Solve for x
   x = 2,114,899.87/1,736.59
6. Step 6: Final answer
   x = 1,217.85