Finding the Fourth Proportional to 1,003.50, 1,385.69 and 631.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.50 : 1,385.69 = 631.10 : x
2. Step 2: Convert to fraction form
   1,003.50/1,385.69 = 631.10/x
3. Step 3: Cross multiply
   1,003.50x = 1,385.69 × 631.10
4. Step 4: Simplify right side
   1,003.50x = 874,509.27
5. Step 5: Solve for x
   x = 874,509.27/1,003.50
6. Step 6: Final answer
   x = 871.46