Finding the Fourth Proportional to 1,127.02, 1,555.31 and 629.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.02 : 1,555.31 = 629.69 : x
2. Step 2: Convert to fraction form
   1,127.02/1,555.31 = 629.69/x
3. Step 3: Cross multiply
   1,127.02x = 1,555.31 × 629.69
4. Step 4: Simplify right side
   1,127.02x = 979,363.15
5. Step 5: Solve for x
   x = 979,363.15/1,127.02
6. Step 6: Final answer
   x = 868.98