Finding the Fourth Proportional to 1,018.72, 1,407 and 670.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.72 : 1,407 = 670.96 : x
2. Step 2: Convert to fraction form
   1,018.72/1,407 = 670.96/x
3. Step 3: Cross multiply
   1,018.72x = 1,407 × 670.96
4. Step 4: Simplify right side
   1,018.72x = 944,040.72
5. Step 5: Solve for x
   x = 944,040.72/1,018.72
6. Step 6: Final answer
   x = 926.69