Finding the Fourth Proportional to 1,127.80, 1,556.72 and 686.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.80 : 1,556.72 = 686.02 : x
2. Step 2: Convert to fraction form
   1,127.80/1,556.72 = 686.02/x
3. Step 3: Cross multiply
   1,127.80x = 1,556.72 × 686.02
4. Step 4: Simplify right side
   1,127.80x = 1,067,941.05
5. Step 5: Solve for x
   x = 1,067,941.05/1,127.80
6. Step 6: Final answer
   x = 946.92