Finding the Fourth Proportional to 1,003.38, 1,385.51 and 630.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.38 : 1,385.51 = 630.98 : x
2. Step 2: Convert to fraction form
   1,003.38/1,385.51 = 630.98/x
3. Step 3: Cross multiply
   1,003.38x = 1,385.51 × 630.98
4. Step 4: Simplify right side
   1,003.38x = 874,229.10
5. Step 5: Solve for x
   x = 874,229.10/1,003.38
6. Step 6: Final answer
   x = 871.28