Finding the Fourth Proportional to 1,128.04, 1,556.01 and 686.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.04 : 1,556.01 = 686.25 : x
2. Step 2: Convert to fraction form
   1,128.04/1,556.01 = 686.25/x
3. Step 3: Cross multiply
   1,128.04x = 1,556.01 × 686.25
4. Step 4: Simplify right side
   1,128.04x = 1,067,811.86
5. Step 5: Solve for x
   x = 1,067,811.86/1,128.04
6. Step 6: Final answer
   x = 946.61