Finding the Fourth Proportional to 978.79, 1,468.52 and 613.14

Step by Step Solution

1. Step 1: Write the proportion equation
   978.79 : 1,468.52 = 613.14 : x
2. Step 2: Convert to fraction form
   978.79/1,468.52 = 613.14/x
3. Step 3: Cross multiply
   978.79x = 1,468.52 × 613.14
4. Step 4: Simplify right side
   978.79x = 900,408.35
5. Step 5: Solve for x
   x = 900,408.35/978.79
6. Step 6: Final answer
   x = 919.92