Finding the Fourth Proportional to 1,233.47, 1,851.53 and 686.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,233.47 : 1,851.53 = 686.72 : x
2. Step 2: Convert to fraction form
   1,233.47/1,851.53 = 686.72/x
3. Step 3: Cross multiply
   1,233.47x = 1,851.53 × 686.72
4. Step 4: Simplify right side
   1,233.47x = 1,271,483.88
5. Step 5: Solve for x
   x = 1,271,483.88/1,233.47
6. Step 6: Final answer
   x = 1,030.82