Finding the Fourth Proportional to 1,004.57, 1,385.06 and 631.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,004.57 : 1,385.06 = 631.42 : x
2. Step 2: Convert to fraction form
   1,004.57/1,385.06 = 631.42/x
3. Step 3: Cross multiply
   1,004.57x = 1,385.06 × 631.42
4. Step 4: Simplify right side
   1,004.57x = 874,554.59
5. Step 5: Solve for x
   x = 874,554.59/1,004.57
6. Step 6: Final answer
   x = 870.58