Finding the Fourth Proportional to 1,686.47, 2,530.04 and 712.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.47 : 2,530.04 = 712.57 : x
2. Step 2: Convert to fraction form
   1,686.47/2,530.04 = 712.57/x
3. Step 3: Cross multiply
   1,686.47x = 2,530.04 × 712.57
4. Step 4: Simplify right side
   1,686.47x = 1,802,830.60
5. Step 5: Solve for x
   x = 1,802,830.60/1,686.47
6. Step 6: Final answer
   x = 1,069.00