Finding the Fourth Proportional to 978.72, 1,349.61 and 800.37

Step by Step Solution

1. Step 1: Write the proportion equation
   978.72 : 1,349.61 = 800.37 : x
2. Step 2: Convert to fraction form
   978.72/1,349.61 = 800.37/x
3. Step 3: Cross multiply
   978.72x = 1,349.61 × 800.37
4. Step 4: Simplify right side
   978.72x = 1,080,187.36
5. Step 5: Solve for x
   x = 1,080,187.36/978.72
6. Step 6: Final answer
   x = 1,103.67