Finding the Fourth Proportional to 978.91, 1,466.60 and 539.69

Step by Step Solution

1. Step 1: Write the proportion equation
   978.91 : 1,466.60 = 539.69 : x
2. Step 2: Convert to fraction form
   978.91/1,466.60 = 539.69/x
3. Step 3: Cross multiply
   978.91x = 1,466.60 × 539.69
4. Step 4: Simplify right side
   978.91x = 791,499.32
5. Step 5: Solve for x
   x = 791,499.32/978.91
6. Step 6: Final answer
   x = 808.55