Finding the Fourth Proportional to 1,005.16, 1,393.72 and 992.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.16 : 1,393.72 = 992.92 : x
2. Step 2: Convert to fraction form
   1,005.16/1,393.72 = 992.92/x
3. Step 3: Cross multiply
   1,005.16x = 1,393.72 × 992.92
4. Step 4: Simplify right side
   1,005.16x = 1,383,852.46
5. Step 5: Solve for x
   x = 1,383,852.46/1,005.16
6. Step 6: Final answer
   x = 1,376.75