Finding the Fourth Proportional to 1,003.21, 1,381.40 and 792.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.21 : 1,381.40 = 792.71 : x
2. Step 2: Convert to fraction form
   1,003.21/1,381.40 = 792.71/x
3. Step 3: Cross multiply
   1,003.21x = 1,381.40 × 792.71
4. Step 4: Simplify right side
   1,003.21x = 1,095,049.59
5. Step 5: Solve for x
   x = 1,095,049.59/1,003.21
6. Step 6: Final answer
   x = 1,091.55