Finding the Fourth Proportional to 1,320.02, 1,978.65 and 539.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.02 : 1,978.65 = 539.69 : x
2. Step 2: Convert to fraction form
   1,320.02/1,978.65 = 539.69/x
3. Step 3: Cross multiply
   1,320.02x = 1,978.65 × 539.69
4. Step 4: Simplify right side
   1,320.02x = 1,067,847.73
5. Step 5: Solve for x
   x = 1,067,847.73/1,320.02
6. Step 6: Final answer
   x = 808.97