Finding the Fourth Proportional to 978.96, 1,468.18 and 670.76

Step by Step Solution

1. Step 1: Write the proportion equation
   978.96 : 1,468.18 = 670.76 : x
2. Step 2: Convert to fraction form
   978.96/1,468.18 = 670.76/x
3. Step 3: Cross multiply
   978.96x = 1,468.18 × 670.76
4. Step 4: Simplify right side
   978.96x = 984,796.42
5. Step 5: Solve for x
   x = 984,796.42/978.96
6. Step 6: Final answer
   x = 1,005.96