Finding the Fourth Proportional to 1,066.78, 1,472.41 and 712.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.78 : 1,472.41 = 712.72 : x
2. Step 2: Convert to fraction form
   1,066.78/1,472.41 = 712.72/x
3. Step 3: Cross multiply
   1,066.78x = 1,472.41 × 712.72
4. Step 4: Simplify right side
   1,066.78x = 1,049,416.06
5. Step 5: Solve for x
   x = 1,049,416.06/1,066.78
6. Step 6: Final answer
   x = 983.72