Finding the Fourth Proportional to 1,004.18, 1,385.71 and 631.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,004.18 : 1,385.71 = 631.04 : x
2. Step 2: Convert to fraction form
   1,004.18/1,385.71 = 631.04/x
3. Step 3: Cross multiply
   1,004.18x = 1,385.71 × 631.04
4. Step 4: Simplify right side
   1,004.18x = 874,429.93
5. Step 5: Solve for x
   x = 874,429.93/1,004.18
6. Step 6: Final answer
   x = 870.79