Finding the Fourth Proportional to 1,127.72, 1,556.16 and 630.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.72 : 1,556.16 = 630.43 : x
2. Step 2: Convert to fraction form
   1,127.72/1,556.16 = 630.43/x
3. Step 3: Cross multiply
   1,127.72x = 1,556.16 × 630.43
4. Step 4: Simplify right side
   1,127.72x = 981,055.99
5. Step 5: Solve for x
   x = 981,055.99/1,127.72
6. Step 6: Final answer
   x = 869.94