Finding the Fourth Proportional to 1,003.69, 1,507.16 and 621.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.69 : 1,507.16 = 621.37 : x
2. Step 2: Convert to fraction form
   1,003.69/1,507.16 = 621.37/x
3. Step 3: Cross multiply
   1,003.69x = 1,507.16 × 621.37
4. Step 4: Simplify right side
   1,003.69x = 936,504.01
5. Step 5: Solve for x
   x = 936,504.01/1,003.69
6. Step 6: Final answer
   x = 933.06