Finding the Fourth Proportional to 1,319.69, 1,980.59 and 540.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,319.69 : 1,980.59 = 540.27 : x
2. Step 2: Convert to fraction form
   1,319.69/1,980.59 = 540.27/x
3. Step 3: Cross multiply
   1,319.69x = 1,980.59 × 540.27
4. Step 4: Simplify right side
   1,319.69x = 1,070,050.66
5. Step 5: Solve for x
   x = 1,070,050.66/1,319.69
6. Step 6: Final answer
   x = 810.83