Finding the Fourth Proportional to 1,087.07, 1,636.71 and 957.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.07 : 1,636.71 = 957.88 : x
2. Step 2: Convert to fraction form
   1,087.07/1,636.71 = 957.88/x
3. Step 3: Cross multiply
   1,087.07x = 1,636.71 × 957.88
4. Step 4: Simplify right side
   1,087.07x = 1,567,761.02
5. Step 5: Solve for x
   x = 1,567,761.02/1,087.07
6. Step 6: Final answer
   x = 1,442.19