Finding the Fourth Proportional to 744.72, 1,113 and 686.34

Step by Step Solution

1. Step 1: Write the proportion equation
   744.72 : 1,113 = 686.34 : x
2. Step 2: Convert to fraction form
   744.72/1,113 = 686.34/x
3. Step 3: Cross multiply
   744.72x = 1,113 × 686.34
4. Step 4: Simplify right side
   744.72x = 763,896.42
5. Step 5: Solve for x
   x = 763,896.42/744.72
6. Step 6: Final answer
   x = 1,025.75