Finding the Fourth Proportional to 1,243.12, 1,715.89 and 801.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.12 : 1,715.89 = 801.02 : x
2. Step 2: Convert to fraction form
   1,243.12/1,715.89 = 801.02/x
3. Step 3: Cross multiply
   1,243.12x = 1,715.89 × 801.02
4. Step 4: Simplify right side
   1,243.12x = 1,374,462.21
5. Step 5: Solve for x
   x = 1,374,462.21/1,243.12
6. Step 6: Final answer
   x = 1,105.66