Finding the Fourth Proportional to 3,086.72, 4,630.30 and 978.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,086.72 : 4,630.30 = 978.83 : x
2. Step 2: Convert to fraction form
   3,086.72/4,630.30 = 978.83/x
3. Step 3: Cross multiply
   3,086.72x = 4,630.30 × 978.83
4. Step 4: Simplify right side
   3,086.72x = 4,532,276.55
5. Step 5: Solve for x
   x = 4,532,276.55/3,086.72
6. Step 6: Final answer
   x = 1,468.31