Finding the Fourth Proportional to 1,104.15, 1,655.68 and 642.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,104.15 : 1,655.68 = 642.09 : x
2. Step 2: Convert to fraction form
   1,104.15/1,655.68 = 642.09/x
3. Step 3: Cross multiply
   1,104.15x = 1,655.68 × 642.09
4. Step 4: Simplify right side
   1,104.15x = 1,063,097.55
5. Step 5: Solve for x
   x = 1,063,097.55/1,104.15
6. Step 6: Final answer
   x = 962.82