Finding the Fourth Proportional to 1,321.38, 1,823.72 and 790.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.38 : 1,823.72 = 790.29 : x
2. Step 2: Convert to fraction form
   1,321.38/1,823.72 = 790.29/x
3. Step 3: Cross multiply
   1,321.38x = 1,823.72 × 790.29
4. Step 4: Simplify right side
   1,321.38x = 1,441,263.73
5. Step 5: Solve for x
   x = 1,441,263.73/1,321.38
6. Step 6: Final answer
   x = 1,090.73