Finding the Fourth Proportional to 1,321.82, 1,980.33 and 801.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.82 : 1,980.33 = 801.95 : x
2. Step 2: Convert to fraction form
   1,321.82/1,980.33 = 801.95/x
3. Step 3: Cross multiply
   1,321.82x = 1,980.33 × 801.95
4. Step 4: Simplify right side
   1,321.82x = 1,588,128.38
5. Step 5: Solve for x
   x = 1,588,128.38/1,321.82
6. Step 6: Final answer
   x = 1,201.47