Finding the Fourth Proportional to 1,003.36, 1,385.52 and 630.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.36 : 1,385.52 = 630.98 : x
2. Step 2: Convert to fraction form
   1,003.36/1,385.52 = 630.98/x
3. Step 3: Cross multiply
   1,003.36x = 1,385.52 × 630.98
4. Step 4: Simplify right side
   1,003.36x = 874,235.41
5. Step 5: Solve for x
   x = 874,235.41/1,003.36
6. Step 6: Final answer
   x = 871.31