Finding the Fourth Proportional to 1,034.94, 1,427.72 and 642.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,034.94 : 1,427.72 = 642.09 : x
2. Step 2: Convert to fraction form
   1,034.94/1,427.72 = 642.09/x
3. Step 3: Cross multiply
   1,034.94x = 1,427.72 × 642.09
4. Step 4: Simplify right side
   1,034.94x = 916,721.52
5. Step 5: Solve for x
   x = 916,721.52/1,034.94
6. Step 6: Final answer
   x = 885.77