Finding the Fourth Proportional to 1,236.31, 1,706.72 and 955.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,236.31 : 1,706.72 = 955.91 : x
2. Step 2: Convert to fraction form
   1,236.31/1,706.72 = 955.91/x
3. Step 3: Cross multiply
   1,236.31x = 1,706.72 × 955.91
4. Step 4: Simplify right side
   1,236.31x = 1,631,470.72
5. Step 5: Solve for x
   x = 1,631,470.72/1,236.31
6. Step 6: Final answer
   x = 1,319.63