Finding the Fourth Proportional to 1,242.59, 1,715.15 and 800.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.59 : 1,715.15 = 800.48 : x
2. Step 2: Convert to fraction form
   1,242.59/1,715.15 = 800.48/x
3. Step 3: Cross multiply
   1,242.59x = 1,715.15 × 800.48
4. Step 4: Simplify right side
   1,242.59x = 1,372,930.69
5. Step 5: Solve for x
   x = 1,372,930.69/1,242.59
6. Step 6: Final answer
   x = 1,104.90