Finding the Fourth Proportional to 1,255.07, 1,731.78 and 836.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,255.07 : 1,731.78 = 836.05 : x
2. Step 2: Convert to fraction form
   1,255.07/1,731.78 = 836.05/x
3. Step 3: Cross multiply
   1,255.07x = 1,731.78 × 836.05
4. Step 4: Simplify right side
   1,255.07x = 1,447,849.15
5. Step 5: Solve for x
   x = 1,447,849.15/1,255.07
6. Step 6: Final answer
   x = 1,153.60