Finding the Fourth Proportional to 978.42, 1,349.01 and 791.22

Step by Step Solution

1. Step 1: Write the proportion equation
   978.42 : 1,349.01 = 791.22 : x
2. Step 2: Convert to fraction form
   978.42/1,349.01 = 791.22/x
3. Step 3: Cross multiply
   978.42x = 1,349.01 × 791.22
4. Step 4: Simplify right side
   978.42x = 1,067,363.69
5. Step 5: Solve for x
   x = 1,067,363.69/978.42
6. Step 6: Final answer
   x = 1,090.91