Finding the Fourth Proportional to 1,077.72, 1,487.16 and 629.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.72 : 1,487.16 = 629.69 : x
2. Step 2: Convert to fraction form
   1,077.72/1,487.16 = 629.69/x
3. Step 3: Cross multiply
   1,077.72x = 1,487.16 × 629.69
4. Step 4: Simplify right side
   1,077.72x = 936,442.34
5. Step 5: Solve for x
   x = 936,442.34/1,077.72
6. Step 6: Final answer
   x = 868.91