Finding the Fourth Proportional to 1,004.33, 1,385.76 and 631.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,004.33 : 1,385.76 = 631.39 : x
2. Step 2: Convert to fraction form
   1,004.33/1,385.76 = 631.39/x
3. Step 3: Cross multiply
   1,004.33x = 1,385.76 × 631.39
4. Step 4: Simplify right side
   1,004.33x = 874,955.01
5. Step 5: Solve for x
   x = 874,955.01/1,004.33
6. Step 6: Final answer
   x = 871.18